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          <link:loc xlink:type="locator" xlink:href="cik0000067590-20260131.xsd#cik0000067590_USTreasuryObligationsMember" xlink:label="loc_cik0000067590_USTreasuryObligationsMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0000067590_USTreasuryObligationsMember" xml:lang="en-US">U.S. Treasury Obligations [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0000067590_USTreasuryObligationsMember" xlink:to="lab_cik0000067590_USTreasuryObligationsMember" />
          <link:loc xlink:type="locator" xlink:href="cik0000067590-20260131.xsd#cik0000067590_USGovernmentAgencyObligationsMember" xlink:label="loc_cik0000067590_USGovernmentAgencyObligationsMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0000067590_USGovernmentAgencyObligationsMember" xml:lang="en-US">U.S. Government Agency Obligations [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0000067590_USGovernmentAgencyObligationsMember" xlink:to="lab_cik0000067590_USGovernmentAgencyObligationsMember" />
          <link:loc xlink:type="locator" xlink:href="cik0000067590-20260131.xsd#cik0000067590_TotalBeforeLiabilitiesInExcessOfOtherAssetsMember" xlink:label="loc_cik0000067590_TotalBeforeLiabilitiesInExcessOfOtherAssetsMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0000067590_TotalBeforeLiabilitiesInExcessOfOtherAssetsMember" xml:lang="en-US">Total Before Liabilities In Excess Of Other Assets [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0000067590_TotalBeforeLiabilitiesInExcessOfOtherAssetsMember" xlink:to="lab_cik0000067590_TotalBeforeLiabilitiesInExcessOfOtherAssetsMember" />
          <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepurchaseAgreementsMember" xlink:label="loc_us-gaap_RepurchaseAgreementsMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_us-gaap_RepurchaseAgreementsMember" xml:lang="en-US">Repurchase Agreements [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RepurchaseAgreementsMember" xlink:to="lab_us-gaap_RepurchaseAgreementsMember" />
          <link:loc xlink:type="locator" xlink:href="cik0000067590-20260131.xsd#cik0000067590_LiabilitiesInExcessOfOtherAssetsMember" xlink:label="loc_cik0000067590_LiabilitiesInExcessOfOtherAssetsMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0000067590_LiabilitiesInExcessOfOtherAssetsMember" xml:lang="en-US">Liabilities In Excess Of Other Assets [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0000067590_LiabilitiesInExcessOfOtherAssetsMember" xlink:to="lab_cik0000067590_LiabilitiesInExcessOfOtherAssetsMember" />
        </link:labelLink>
      </link:linkbase>
    </appinfo>
  </annotation>
  <import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" />
  <import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <import namespace="http://fasb.org/us-gaap/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd" />
  <import namespace="http://xbrl.sec.gov/country/2025" schemaLocation="https://xbrl.sec.gov/country/2025/country-2025.xsd" />
  <import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd" />
  <import namespace="http://www.xbrl.org/2009/role/net" schemaLocation="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd" />
  <import namespace="http://www.xbrl.org/2009/arcrole/fact-explanatoryFact" schemaLocation="http://www.xbrl.org/lrr/arcrole/factExplanatory-2009-12-16.xsd" />
  <import namespace="http://xbrl.sec.gov/dei/2025" schemaLocation="https://xbrl.sec.gov/dei/2025/dei-2025.xsd" />
  <import namespace="http://fasb.org/us-types/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-types-2025.xsd" />
  <import namespace="http://fasb.org/srt-types/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-types-2025.xsd" />
  <import namespace="http://fasb.org/srt/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd" />
  <import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd" />
  <import namespace="http://xbrl.sec.gov/stpr/2025" schemaLocation="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd" />
  <import namespace="http://xbrl.sec.gov/oef-sr/2025" schemaLocation="https://xbrl.sec.gov/oef/2025/oef-sr-2025.xsd" />
  <element name="C000012411Member" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0000067590_C000012411Member" substitutionGroup="xbrli:item" />
  <element name="C000012410Member" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0000067590_C000012410Member" substitutionGroup="xbrli:item" />
  <element name="C000012412Member" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0000067590_C000012412Member" substitutionGroup="xbrli:item" />
  <element name="C000242850Member" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0000067590_C000242850Member" substitutionGroup="xbrli:item" />
  <element name="USTreasuryObligationsMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0000067590_USTreasuryObligationsMember" substitutionGroup="xbrli:item" />
  <element name="USGovernmentAgencyObligationsMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0000067590_USGovernmentAgencyObligationsMember" substitutionGroup="xbrli:item" />
  <element name="TotalBeforeLiabilitiesInExcessOfOtherAssetsMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0000067590_TotalBeforeLiabilitiesInExcessOfOtherAssetsMember" substitutionGroup="xbrli:item" />
  <element name="LiabilitiesInExcessOfOtherAssetsMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0000067590_LiabilitiesInExcessOfOtherAssetsMember" substitutionGroup="xbrli:item" />
</schema>
