D.
Dana, Professor, [149].
Darwin, Mr. Charles, [2], [10], [12], [14]-[21], [23], [27], [34], [35], [43], [45], [47], [48], [55]-[57], [59], [65], [88], [94], [98]-[100], [107], [118]-[126], [129], [138], [142], [145], [149], [150], [181], [188]-[190], [196], [208], [209], [214]-[216], [218], [223], [233], [234], [252], [254], [258], [259], [275], [276].
Datura tatula, [101].
Delhi, days at, [98].
Delpino, Signor, [212], [213], [215].
Democritus, [217], [275], [288].
Density of air for breathing, [99].
Dentition, carnivorous, [110].
Derivation, [238].