crossing of Labrador and penguin, ii. [97];
increased fertility of, by domestication, ii. [112];
general fertility of, in confinement, ii. [157];
increase of size of, by care in breeding, ii. [199];
change produced by domestication in, ii. [262].
Duméril, Aug., breeding of Siredon in the branchiferous stage, ii. [384].
Dun-coloured horses, origin of, i. 59.
Dureau de la Malle, feral pigs in Louisiana, ii. [33];
feral fowls in Africa, ibid.;
bud-variation in the pear, i. 376;