his dislike for speculation, [101];

his optimism and courage, [77];

his birth and education, [95], [96];

life at Edinburgh, [97];

at Cambridge, [97], [98];

voyage in the 'Beagle,' [99], [100];

first awakening to the idea of Evolution, [102], [104];

work with Lyell at Geological Society, [105];

begins 'species work,' [106];

influence of Malthus's work on, [107];