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          <RecipientUSAddress>
            <AddressLine1Txt>6300 OCEAN DRIVE 5741</AddressLine1Txt>
            <AddressLine2Txt>6300 OCEAN DRIVE 5741</AddressLine2Txt>
            <CityNm>CORPUS CHRISTI</CityNm>
            <StateAbbreviationCd>TX</StateAbbreviationCd>
            <ZIPCd>78412</ZIPCd>
          </RecipientUSAddress>
          <RecipientRelationshipTxt>NONE</RecipientRelationshipTxt>
          <RecipientFoundationStatusTxt>501(C)(3)</RecipientFoundationStatusTxt>
          <GrantOrContributionPurposeTxt>DR. TUNNELL GULF OF MEXICO FELLOWSHI</GrantOrContributionPurposeTxt>
          <Amt>100000</Amt>
        </GrantOrContributionPdDurYrGrp>
        <GrantOrContributionPdDurYrGrp>
          <RecipientBusinessName>
            <BusinessNameLine1Txt>TEXAS WATER FOUNDATION</BusinessNameLine1Txt>
            <BusinessNameLine2Txt>TEXAS WATER FOUNDATION</BusinessNameLine2Txt>
          </RecipientBusinessName>
          <RecipientUSAddress>
            <AddressLine1Txt>PO BOX 13252</AddressLine1Txt>
            <AddressLine2Txt>PO BOX 13252</AddressLine2Txt>
            <CityNm>AUSTIN</CityNm>
            <StateAbbreviationCd>TX</StateAbbreviationCd>
            <ZIPCd>78711</ZIPCd>
          </RecipientUSAddress>
          <RecipientRelationshipTxt>NONE</RecipientRelationshipTxt>
          <RecipientFoundationStatusTxt>501(C)(3)</RecipientFoundationStatusTxt>
          <GrantOrContributionPurposeTxt>GENERAL CHARITABLE PURPOSES</GrantOrContributionPurposeTxt>
          <Amt>100000</Amt>
        </GrantOrContributionPdDurYrGrp>
        <GrantOrContributionPdDurYrGrp>
          <RecipientBusinessName>
            <BusinessNameLine1Txt>TEXAS WATER TRADE</BusinessNameLine1Txt>
            <BusinessNameLine2Txt>TEXAS WATER TRADE</BusinessNameLine2Txt>
          </RecipientBusinessName>
          <RecipientUSAddress>
            <AddressLine1Txt>611 S CONGRESS AVE NO 125</AddressLine1Txt>
            <AddressLine2Txt>611 S CONGRESS AVE NO 125</AddressLine2Txt>
            <CityNm>AUSTIN</CityNm>
            <StateAbbreviationCd>TX</StateAbbreviationCd>
            <ZIPCd>78704</ZIPCd>
          </RecipientUSAddress>
          <RecipientRelationshipTxt>NONE</RecipientRelationshipTxt>
          <RecipientFoundationStatusTxt>501(C)(3)</RecipientFoundationStatusTxt>
          <GrantOrContributionPurposeTxt>GENERAL CHARITABLE PURPOSES</GrantOrContributionPurposeTxt>
          <Amt>375000</Amt>
        </GrantOrContributionPdDurYrGrp>
        <GrantOrContributionPdDurYrGrp>
          <RecipientBusinessName>
            <BusinessNameLine1Txt>US ENDOWMENT FOR FORESTRY &amp; COMMUNI</BusinessNameLine1Txt>
            <BusinessNameLine2Txt>US ENDOWMENT FOR FORESTRY &amp; COMMUNI</BusinessNameLine2Txt>
          </RecipientBusinessName>
          <RecipientUSAddress>
            <AddressLine1Txt>908 E NORTH ST</AddressLine1Txt>
            <AddressLine2Txt>908 E NORHT ST</AddressLine2Txt>
            <CityNm>GREENVILLE</CityNm>
            <StateAbbreviationCd>SC</StateAbbreviationCd>
            <ZIPCd>29601</ZIPCd>
          </RecipientUSAddress>
          <RecipientRelationshipTxt>NONE</RecipientRelationshipTxt>
          <RecipientFoundationStatusTxt>501(C)(3)</RecipientFoundationStatusTxt>
          <GrantOrContributionPurposeTxt>TX ENVIRONMENTAL IMPACT BOND</GrantOrContributionPurposeTxt>
          <Amt>10000</Amt>
        </GrantOrContributionPdDurYrGrp>
        <TotalGrantOrContriPdDurYrAmt>2724378</TotalGrantOrContriPdDurYrAmt>
      </SupplementaryInformationGrp>
      <AnalysisIncomeProducingActyGrp>
        <IntOnSavAndTempCashInvstGrp>
          <ExclusionCd>14</ExclusionCd>
          <ExclusionAmt>296811</ExclusionAmt>
        </IntOnSavAndTempCashInvstGrp>
        <DividendsAndInterestFromSecDtl>
          <ExclusionCd>14</ExclusionCd>
          <ExclusionAmt>469370</ExclusionAmt>
        </DividendsAndInterestFromSecDtl>
        <OtherInvestmentIncomeGrp>
          <ExclusionCd>15</ExclusionCd>
          <ExclusionAmt>24073</ExclusionAmt>
        </OtherInvestmentIncomeGrp>
        <GainSalesAstOthThanInvntryGrp>
          <ExclusionCd>18</ExclusionCd>
          <ExclusionAmt>-954364</ExclusionAmt>
        </GainSalesAstOthThanInvntryGrp>
        <OtherRevenueDescribedGrp>
          <Desc>CARRARA PARTNERSHIP</Desc>
          <BusinessCd>531120</BusinessCd>
          <UnrelatedBusinessTaxblIncmAmt>-7</UnrelatedBusinessTaxblIncmAmt>
        </OtherRevenueDescribedGrp>
        <OtherRevenueDescribedGrp>
          <Desc>IDK PARTNERS</Desc>
          <BusinessCd>901101</BusinessCd>
          <UnrelatedBusinessTaxblIncmAmt>-405</UnrelatedBusinessTaxblIncmAmt>
        </OtherRevenueDescribedGrp>
        <OtherRevenueDescribedGrp>
          <Desc>IDK PARTNERS</Desc>
          <ExclusionCd>14</ExclusionCd>
          <ExclusionAmt>-57</ExclusionAmt>
        </OtherRevenueDescribedGrp>
        <OtherRevenueDescribedGrp>
          <Desc>MERIT ENERGY PARTNERS F-III</Desc>
          <BusinessCd>901101</BusinessCd>
          <UnrelatedBusinessTaxblIncmAmt>1340</UnrelatedBusinessTaxblIncmAmt>
        </OtherRevenueDescribedGrp>
        <OtherRevenueDescribedGrp>
          <Desc>MERIT ENERGY PARTNERS F-III</Desc>
          <ExclusionCd>14</ExclusionCd>
          <ExclusionAmt>44</ExclusionAmt>
        </OtherRevenueDescribedGrp>
        <SubtotalsIncmProducingActyGrp>
          <UnrelatedBusinessTaxblIncmAmt>928</UnrelatedBusinessTaxblIncmAmt>
          <ExclusionAmt>-164123</ExclusionAmt>
        </SubtotalsIncmProducingActyGrp>
        <TotalIncomeProducingActyAmt>-163195</TotalIncomeProducingActyAmt>
      </AnalysisIncomeProducingActyGrp>
      <TrnsfrTransRlnNonchrtblEOGrp>
        <TrnsfrOfCashToNonchrtblEOInd>false</TrnsfrOfCashToNonchrtblEOInd>
        <TrnsfrOtherAssetNonchrtblEOInd>false</TrnsfrOtherAssetNonchrtblEOInd>
        <SalesOrExchangesOfAssetsInd>false</SalesOrExchangesOfAssetsInd>
        <PurchaseOfAssetsNonchrtblEOInd>false</PurchaseOfAssetsNonchrtblEOInd>
        <RentalOfFacilitiesOthAssetsInd>false</RentalOfFacilitiesOthAssetsInd>
        <ReimbursementArrangementsInd>false</ReimbursementArrangementsInd>
        <LoansOrLoanGuaranteesInd>false</LoansOrLoanGuaranteesInd>
        <PerformanceOfServicesEtcInd>false</PerformanceOfServicesEtcInd>
        <SharingOfFacilitiesEtcInd>false</SharingOfFacilitiesEtcInd>
        <RelationshipsNonchrtblEOInd>false</RelationshipsNonchrtblEOInd>
      </TrnsfrTransRlnNonchrtblEOGrp>
    </IRS990PF>
    <InvestmentsCorpStockSchedule documentId="RetDoc1">
      <InvestmentsCorporateStockGrp>
        <StockNm>FROST BROKERAGE ACCOUNT 84</StockNm>
        <EOYBookValueAmt>3589953</EOYBookValueAmt>
        <EOYFMVAmt>3479198</EOYFMVAmt>
      </InvestmentsCorporateStockGrp>
      <InvestmentsCorporateStockGrp>
        <StockNm>FROST BROKERAGE ACCOUNT 54</StockNm>
        <EOYBookValueAmt>2064722</EOYBookValueAmt>
        <EOYFMVAmt>2439870</EOYFMVAmt>
      </InvestmentsCorporateStockGrp>
      <InvestmentsCorporateStockGrp>
        <StockNm>CHARLES SCHWAB BROKERAGE ACCOUNT</StockNm>
        <EOYBookValueAmt>7880696</EOYBookValueAmt>
        <EOYFMVAmt>1441120</EOYFMVAmt>
      </InvestmentsCorporateStockGrp>
      <InvestmentsCorporateStockGrp>
        <StockNm>CAPITAL COUNSEL BROKERAGE ACCOUNT</StockNm>
        <EOYBookValueAmt>19207342</EOYBookValueAmt>
        <EOYFMVAmt>38211928</EOYFMVAmt>
      </InvestmentsCorporateStockGrp>
    </InvestmentsCorpStockSchedule>
    <InvestmentsOtherSchedule2 documentId="RetDoc2">
      <InvestmentsOtherGrp>
        <CategoryOrItemTxt>PARTNERSHIP INVESTMENTS</CategoryOrItemTxt>
        <ListedAtCostOrFMVCd>AT COST</ListedAtCostOrFMVCd>
        <EOYFMVAmt>16849</EOYFMVAmt>
      </InvestmentsOtherGrp>
      <InvestmentsOtherGrp>
        <CategoryOrItemTxt>OIL &amp; GAS ROYALTY INTEREST</CategoryOrItemTxt>
        <ListedAtCostOrFMVCd>AT COST</ListedAtCostOrFMVCd>
        <EOYFMVAmt>37602</EOYFMVAmt>
      </InvestmentsOtherGrp>
    </InvestmentsOtherSchedule2>
    <LegalFeesSchedule documentId="RetDoc3">
      <LegalFeesGrp>
        <CategoryTxt>UHL FITZSIMONS</CategoryTxt>
        <LegalFeesAmt>1426</LegalFeesAmt>
        <NetInvestmentIncomeAmt>1426</NetInvestmentIncomeAmt>
      </LegalFeesGrp>
    </LegalFeesSchedule>
    <OtherDecreasesSchedule documentId="RetDoc4">
      <OtherDecreasesDetail>
        <Desc>BOOK/TAX DIFFERENCE SECURITIES SOLD</Desc>
        <Amt>21068</Amt>
      </OtherDecreasesDetail>
    </OtherDecreasesSchedule>
    <OtherExpensesSchedule documentId="RetDoc5">
      <OtherExpensesScheduleGrp>
        <Desc>EXPENSES</Desc>
      </OtherExpensesScheduleGrp>
      <OtherExpensesScheduleGrp>
        <Desc>BANK WIRE FEES</Desc>
        <RevenueAndExpensesPerBooksAmt>118</RevenueAndExpensesPerBooksAmt>
        <DisbursementsCharitablePrpsAmt>118</DisbursementsCharitablePrpsAmt>
      </OtherExpensesScheduleGrp>
    </OtherExpensesSchedule>
    <OtherIncomeSchedule2 documentId="RetDoc7">
      <OtherIncomeDetail>
        <Desc>LITIGATION/CLASS ACTION SUITS</Desc>
        <RevenueAndExpensesPerBooksAmt>540</RevenueAndExpensesPerBooksAmt>
        <NetInvestmentIncomeAmt>540</NetInvestmentIncomeAmt>
      </OtherIncomeDetail>
      <OtherIncomeDetail>
        <Desc>OIL &amp; GAS ROYALTIES</Desc>
        <RevenueAndExpensesPerBooksAmt>23533</RevenueAndExpensesPerBooksAmt>
        <NetInvestmentIncomeAmt>23533</NetInvestmentIncomeAmt>
      </OtherIncomeDetail>
      <OtherIncomeDetail>
        <Desc>CARRARA PARTNERSHIP</Desc>
        <RevenueAndExpensesPerBooksAmt>-7</RevenueAndExpensesPerBooksAmt>
      </OtherIncomeDetail>
      <OtherIncomeDetail>
        <Desc>IDK PARTNERS</Desc>
        <RevenueAndExpensesPerBooksAmt>-405</RevenueAndExpensesPerBooksAmt>
      </OtherIncomeDetail>
      <OtherIncomeDetail>
        <Desc>IDK PARTNERS</Desc>
        <RevenueAndExpensesPerBooksAmt>-57</RevenueAndExpensesPerBooksAmt>
      </OtherIncomeDetail>
      <OtherIncomeDetail>
        <Desc>MERIT ENERGY PARTNERS F-III</Desc>
        <RevenueAndExpensesPerBooksAmt>1340</RevenueAndExpensesPerBooksAmt>
      </OtherIncomeDetail>
      <OtherIncomeDetail>
        <Desc>MERIT ENERGY PARTNERS F-III</Desc>
        <RevenueAndExpensesPerBooksAmt>44</RevenueAndExpensesPerBooksAmt>
      </OtherIncomeDetail>
    </OtherIncomeSchedule2>
    <OtherIncreasesSchedule documentId="RetDoc6">
      <OtherIncreasesDetail>
        <Desc>BOOK/TAX DIFFERENCE PARTERSHIP DISSOLUTION</Desc>
        <Amt>51</Amt>
      </OtherIncreasesDetail>
      <OtherIncreasesDetail>
        <Desc>BOOK/TAX DIFFERENCE SECURITIES SOLD</Desc>
        <Amt>300300</Amt>
      </OtherIncreasesDetail>
    </OtherIncreasesSchedule>
    <OtherProfessionalFeesSchedule documentId="RetDoc8">
      <OtherProfessionalFeesDetail>
        <CategoryTxt>FROST BROKERAGE ADVISORY FEES</CategoryTxt>
        <Amt>26346</Amt>
        <NetInvestmentIncomeAmt>26346</NetInvestmentIncomeAmt>
      </OtherProfessionalFeesDetail>
      <OtherProfessionalFeesDetail>
        <CategoryTxt>DUCENTA SQUARED ASSET MANAGEMENT</CategoryTxt>
        <Amt>28436</Amt>
        <NetInvestmentIncomeAmt>28436</NetInvestmentIncomeAmt>
      </OtherProfessionalFeesDetail>
      <OtherProfessionalFeesDetail>
        <CategoryTxt>CAPITAL COUNSEL ADVISORY FEES</CategoryTxt>
        <Amt>311189</Amt>
        <NetInvestmentIncomeAmt>311189</NetInvestmentIncomeAmt>
      </OtherProfessionalFeesDetail>
    </OtherProfessionalFeesSchedule>
    <TaxesSchedule documentId="RetDoc9">
      <TaxesDetail>
        <CategoryTxt>AD VALOREM TAXES</CategoryTxt>
        <Amt>56</Amt>
        <NetInvestmentIncomeAmt>56</NetInvestmentIncomeAmt>
      </TaxesDetail>
      <TaxesDetail>
        <CategoryTxt>FEDERAL EXCISE TAX PAYMENTS</CategoryTxt>
        <Amt>2000</Amt>
      </TaxesDetail>
      <TaxesDetail>
        <CategoryTxt>FOREIGN INCOME TAXES</CategoryTxt>
        <Amt>20</Amt>
        <NetInvestmentIncomeAmt>20</NetInvestmentIncomeAmt>
      </TaxesDetail>
    </TaxesSchedule>
  </ReturnData>
</Return>
