<Tr> <Td> James M. Russell </Td> <Td> Whig </Td> <Td> December 21, 1841--March 3, 1843 </Td> <Td> Elected to finish Black's term . Retired . </Td> <Td> (Data unknown / missing .) </Td> </Tr> <Tr> <Td> Andrew Stewart </Td> <Td> Whig </Td> <Td> March 4, 1843--March 3, 1849 </Td> <Td> First elected in 1842 . Re-elected in 1844 . Re-elected in 1846 . Retired . </Td> <Td> (Data unknown / missing .) </Td> </Tr> <Tr> <Td> Andrew J. Ogle </Td> <Td> Whig </Td> <Td> March 4, 1849--March 3, 1851 </Td> <Td> Elected in 1848 . Lost re-election . </Td> <Td> (Data unknown / missing .) </Td> </Tr> <Tr> <Td> John L. Dawson </Td> <Td> Democratic </Td> <Td> March 4, 1851--March 3, 1853 </Td> <Td> Elected in 1850 . Redistricted to the 20th district . </Td> <Td> (Data unknown / missing .) </Td> </Tr>

What makes up the 18th district in pa