ancestors of, [350].

Caterpillars, and moths, how find their way, [158]-163;

change to butterflies, [297] and following.

Cells, [31]-41, [238];

of eggs, [25]-27;

of human beings, [27]-29;

of plants, [35]-37;

of bone, [45].

Chick, hatching of, [1]-2;

growth in eggs, [3]-6;