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        <ManagementAndGeneral>33</ManagementAndGeneral>
        <Fundraising>66</Fundraising>
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      <DepreciationDepletion>
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        <ManagementAndGeneral>1965</ManagementAndGeneral>
        <Fundraising>374</Fundraising>
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      <Insurance>
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        <ProgramServices>3555</ProgramServices>
        <ManagementAndGeneral>995</ManagementAndGeneral>
        <Fundraising>190</Fundraising>
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      <OtherExpenses>
        <Description>DUES AND SUBSCRIPTIONS</Description>
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        <ProgramServices>10088</ProgramServices>
        <ManagementAndGeneral>17</ManagementAndGeneral>
        <Fundraising>3</Fundraising>
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      <OtherExpenses>
        <Description>PROGRAM SUPPLIES</Description>
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        <ProgramServices>3958</ProgramServices>
        <ManagementAndGeneral>340</ManagementAndGeneral>
        <Fundraising>1835</Fundraising>
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      <TotalFunctionalExpenses>
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        <Fundraising>68421</Fundraising>
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      <CashNonInterestBearing>
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        <EOY>117800</EOY>
      </CashNonInterestBearing>
      <SavingsAndTempCashInvestments>
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        <EOY>484017</EOY>
      </SavingsAndTempCashInvestments>
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        <EOY>1446539</EOY>
      </PledgesAndGrantsReceivable>
      <PrepaidExpensesDeferredCharges>
        <BOY>14962</BOY>
        <EOY>17375</EOY>
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      <LandBuildingsEquipmentBasis>167759</LandBuildingsEquipmentBasis>
      <LandBldgEquipmentAccumDeprec>162082</LandBldgEquipmentAccumDeprec>
      <LandBuildingsEquipmentBasisNet>
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        <EOY>5677</EOY>
      </LandBuildingsEquipmentBasisNet>
      <OtherAssetsTotal>
        <BOY>9246</BOY>
        <EOY>9246</EOY>
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      <TotalAssets>
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        <EOY>2080654</EOY>
      </TotalAssets>
      <AccountsPayableAccruedExpenses>
        <BOY>116934</BOY>
        <EOY>133110</EOY>
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      <TotalLiabilities>
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        <EOY>133110</EOY>
      </TotalLiabilities>
      <FollowSFAS117>X</FollowSFAS117>
      <UnrestrictedNetAssets>
        <BOY>448944</BOY>
        <EOY>407766</EOY>
      </UnrestrictedNetAssets>
      <TemporarilyRestrictedNetAssets>
        <BOY>471347</BOY>
        <EOY>1539778</EOY>
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      <TotalNetAssetsFundBalances>
        <BOY>920291</BOY>
        <EOY>1947544</EOY>
      </TotalNetAssetsFundBalances>
      <TotalLiabNetAssetsFundBalances>
        <BOY>1037225</BOY>
        <EOY>2080654</EOY>
      </TotalLiabNetAssetsFundBalances>
      <ReconcilationRevenueExpenses>1027253</ReconcilationRevenueExpenses>
      <ReconcilationOtherChanges>0</ReconcilationOtherChanges>
      <MethodOfAccountingAccrual>X</MethodOfAccountingAccrual>
      <AccountantCompileOrReview>0</AccountantCompileOrReview>
      <FSAudited>1</FSAudited>
      <AuditCommittee>1</AuditCommittee>
      <FinancialStatementSeparate>X</FinancialStatementSeparate>
      <FederalGrantAuditRequired>0</FederalGrantAuditRequired>
    </IRS990>
    <IRS990ScheduleA documentId="RetDoc1039100001">
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      <GiftsGrantsContribReceived170>
        <CurrentTaxYearMinus4Years>1265727</CurrentTaxYearMinus4Years>
        <CurrentTaxYearMinus3Years>1068631</CurrentTaxYearMinus3Years>
        <CurrentTaxYearMinus2Years>1252490</CurrentTaxYearMinus2Years>
        <CurrentTaxYearMinus1Year>1066811</CurrentTaxYearMinus1Year>
        <CurrentTaxYear>2109318</CurrentTaxYear>
        <Total>6762977</Total>
      </GiftsGrantsContribReceived170>
      <Total170>
        <CurrentTaxYearMinus4Years>1265727</CurrentTaxYearMinus4Years>
        <CurrentTaxYearMinus3Years>1068631</CurrentTaxYearMinus3Years>
        <CurrentTaxYearMinus2Years>1252490</CurrentTaxYearMinus2Years>
        <CurrentTaxYearMinus1Year>1066811</CurrentTaxYearMinus1Year>
        <CurrentTaxYear>2109318</CurrentTaxYear>
        <Total>6762977</Total>
      </Total170>
      <AmountsSubstContributorsTotal>927614</AmountsSubstContributorsTotal>
      <PublicSupportTotal170>5835363</PublicSupportTotal170>
      <GrossInvestmentIncome170>
        <CurrentTaxYearMinus4Years>35900</CurrentTaxYearMinus4Years>
        <CurrentTaxYearMinus3Years>21613</CurrentTaxYearMinus3Years>
        <CurrentTaxYearMinus2Years>8141</CurrentTaxYearMinus2Years>
        <CurrentTaxYearMinus1Year>3786</CurrentTaxYearMinus1Year>
        <CurrentTaxYear>2496</CurrentTaxYear>
        <Total>71936</Total>
      </GrossInvestmentIncome170>
      <OtherIncome170>
        <CurrentTaxYearMinus4Years>5758</CurrentTaxYearMinus4Years>
        <CurrentTaxYearMinus3Years>2446</CurrentTaxYearMinus3Years>
        <CurrentTaxYearMinus2Years>7378</CurrentTaxYearMinus2Years>
        <CurrentTaxYearMinus1Year>6800</CurrentTaxYearMinus1Year>
        <CurrentTaxYear>2356</CurrentTaxYear>
        <Total>24738</Total>
      </OtherIncome170>
      <TotalSupport>6859651</TotalSupport>
      <GrossReceiptsFromAdmissionsEtc>700928</GrossReceiptsFromAdmissionsEtc>
      <PublicSupportPertcentage170>0.85070</PublicSupportPertcentage170>
      <PublicSupportPertcentPriorYear>0.77400</PublicSupportPertcentPriorYear>
      <ThirtyThreePercntTestsCY170>X</ThirtyThreePercntTestsCY170>
    </IRS990ScheduleA>
    <IRS990ScheduleB documentId="RetDoc1234500001">
      <ContributorInfo>
        <ContributorNumber>RESTRICTED</ContributorNumber>
        <ContributorNameBusiness>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorNameBusiness>
        <ContributorAddressUS>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorAddressUS>
        <AggregateContributions>RESTRICTED</AggregateContributions>
      </ContributorInfo>
    </IRS990ScheduleB>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <LeaseholdImprovements>
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        <Depreciation>79573</Depreciation>
        <BookValue>0</BookValue>
      </LeaseholdImprovements>
      <Equipment>
        <OtherCostOrOtherBasis>55671</OtherCostOrOtherBasis>
        <Depreciation>49994</Depreciation>
        <BookValue>5677</BookValue>
      </Equipment>
      <OtherLandBuildings>
        <OtherCostOrOtherBasis>32515</OtherCostOrOtherBasis>
        <Depreciation>32515</Depreciation>
        <BookValue>0</BookValue>
      </OtherLandBuildings>
      <TotalOfBookValueLandBuildings>5677</TotalOfBookValueLandBuildings>
      <TotalRevenue>2238543</TotalRevenue>
      <TotalExpenses>1211290</TotalExpenses>
      <ExcessOrDeficitForYear>1027253</ExcessOrDeficitForYear>
      <ExcessOrDeficitPerFS>1027253</ExcessOrDeficitPerFS>
      <TotRevenueEtcAuditedFinclStmt>2238543</TotRevenueEtcAuditedFinclStmt>
      <RevenueNotRptdF990>0</RevenueNotRptdF990>
      <RevenueSubtotal>2238543</RevenueSubtotal>
      <RevenueNotRptdOnFinStmt>0</RevenueNotRptdOnFinStmt>
      <TotalRevenuePerForm990>2238543</TotalRevenuePerForm990>
      <TotExpensesEtcAuditedFinclStmt>1211290</TotExpensesEtcAuditedFinclStmt>
      <ExpensesNotRptdF990>0</ExpensesNotRptdF990>
      <ExpensesSubtotal>1211290</ExpensesSubtotal>
      <ExpensesNotRptdOnFinStmt>0</ExpensesNotRptdOnFinStmt>
      <TotalExpensesPerForm990>1211290</TotalExpensesPerForm990>
      <Form990ScheduleDPartXIV>
        <Identifier>DESCRIPTION OF UNCERTAIN TAX POSITIONS UNDER FIN 48:</Identifier>
        <ReturnReference>PART X:</ReturnReference>
        <Explanation>THE INSTITUTE FOLLOWS THE ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES STANDARD WHICH REQUIRES THE INSTITUTE TO REPORT UNCERTAIN TAX POSITIONS, RELATED INTEREST AND PENALTIES, AND TO ADJUST ITS ASSETS AND LIABILITIES RELATED TO UNRECOGNIZED TAX BENEFITS AND ACCRUED INTEREST AND PENALTIES ACCORDINGLY. AS OF JUNE 30, 2012, THE INSTITUTE DETERMINED THAT THERE ARE NO MATERIAL UNRECOGNIZED TAX BENEFITS TO REPORT. INFORMATION RETURNS FILED FOR THE PRIOR THREE FISCAL YEARS REMAIN SUBJECT TO EXAMINATION BY THE INTERNAL REVENUE SERVICE AND MASSACHUSETTS TAX AUTHORITIES. THE INSTITUTE DOES NOT EXPECT THAT THE AMOUNTS OF UNRECOGNIZED TAX BENEFITS WILL CHANGE SIGNIFICANTLY WITHIN THE NEXT TWELVE MONTHS.</Explanation>
      </Form990ScheduleDPartXIV>
    </IRS990ScheduleD>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION A, LINE 2</ReturnReference>
        <Explanation>ELLEN PARKER, BOARD MEMBER, AND AMY PRESENT, BOARD MEMBER, ARE DOMESTIC PARTNERS. BOTH MEMBERS RESIGNED FROM THE BOARD IN JANUARY, 2012.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION B, LINE 11</ReturnReference>
        <Explanation>A COPY OF FORM 990 IS DISTRIBUTED TO ALL BOARD MEMBERS FOR REVIEW AND APPROVAL BEFORE FORM 990 IS FILED.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION B, LINE 12C</ReturnReference>
        <Explanation>SILENT SPRING INSTITUTE ANNUALLY DISTRIBUTES A CONFLICT OF INTEREST QUESTIONAIRE TO BE COMPLETED AND RETURNED BY ALL KEY EMPLOYEES AND BOARD OF DIRECTOR MEMBERS.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION B, LINE 15</ReturnReference>
        <Explanation>THE EXECUTIVE DIRECTOR'S SALARY IS REVIEWED AND APPROVED ANNUALLY BY THE BOARD OF DIRECTORS AT AN EXECUTIVE SESSION MEETING. SALARIES OF EXECUTIVE DIRECTORS AT COMPARABLE AGENCIES ARE USED TO DETERMINE THE EXECTUIVE DIRECTOR'S SALARY.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION C, LINE 19</ReturnReference>
        <Explanation>GOVERNING DOCUMENTS, POLICIES AND STATEMENTS ARE AVAILABLE TO THE PUBLIC UPON REQUEST.</Explanation>
      </GeneralExplanation>
    </IRS990ScheduleO>
  </ReturnData>
</Return>