Silk-moths, i. 300-304;
domesticated species of, i. 300;
history of, ibid.;
causes of modification in, i. 300-301;
differences presented by, i. 301-304;
crossing of, ii. [98];
disease in, ii. [228];
effects of disuse of parts in, ii. [298];
selection practised with, ii. [197], [199];
variation of, ii. [236];