——, ——, on vegetation of Australia, [379].
——, ——, on fresh-water plants, [386].
——, ——, on insular plants, [389].
Degradation of coast-rocks, [282].
Denudation, rate of, [285].
—— of oldest rocks, [308].
Development of ancient forms, [336].
Devonian system, [334].
Dianthus, fertility of crosses, [256].
Dirt on feet of birds, [362].