——, inherited civilisation of, [215].
——, fertility of breeds together, [254].
——, —— of crosses, [268].
——, proportions of, when young, [444].
Domestication, variation under, [7].
Downing, Mr., on fruit-trees in America, [85].
Downs, North and South, [286].
Dragon-flies, intestines of, [190].
Drift-timber, [360].
Driver-ant, [240].