Mammals, duration of life of, [38].

Manx cats, [427], [430].

Maternal impressions, supposed influence on offspring, [444].

May-flies, length of larval life of, [15];

length of life of imago of, [16];

habitat of larvae of, [17];

shortening of life of, [19];

death of, [120].

Meldola, [395].

Melolontha vulgaris, see Cockchafer.