There are nine spiracles on each side of the caterpillar's body, and never more than one in the side of the same segment. The head, which we have been regarding as the first segment, has no spiracles. The second segment has a pair--one on each side. There are none in the third and fourth; but all the segments, from the fifth to the twelfth inclusive, have each a pair; the last (thirteenth) segment has none. We have already observed the general arrangement of the caterpillar's limbs; but perhaps it may be interesting and even convenient to the reader to give here a little table that will show at a glance the disposition of both limbs and spiracles. First segment--head Two short antennae, two jaws, and twelve eyes. Second " Legs and spiracles. Third " Legs only. Fourth " Legs only. Fifth " Spiracles only. Sixth " Spiracles only. Seventh " Spiracles, and sometimes claspers. Eighth " Spiracles, and sometimes claspers. Ninth " Spiracles, and sometimes claspers. Tenth " Spiracles, and generally claspers. Eleventh " Spiracles only. Twelfth " Spiracles only. Thirteenth " Claspers only, and these occasionally absent. We must now watch the caterpillar through its later days, to see how it prepares for passing into the pupal stage, and to witness the various interesting changes that take place at this period. When fully grown, it ceases to eat, and begins to wander about in search of a convenient spot for the coming event. Its colours fade, and the body becomes appreciably smaller, especially in length, as it ejects the whole contents of its digestive apparatus. According to some accounts, it even evacuates the lining of the intestines with their contents.