Out of the pupa, whether it be cocoon, chrysalis, or just plain pupa case, comes the adult. The main business of adult insects is to reproduce their kind. After the eggs are laid there is little excuse for their living. In the case of a great many kinds of insects death follows soon after. There are some noted exceptions to this rule as for instance the wasps which build with so much skill and patience the homes in which to rear their young, the ants and the bees, both social and solitary, which carry on such a complicated home life. Of these highly "civilized" insects only a word can be spoken here. From the chapter on "Bee-Keeping" and from other books you may learn of the wonders they perform. We must return now to our life history collection. How the subject opens as we add specimens of cocoons and pupa cases to the collection! To get a complete series illustrating the life, let us say, of one of our common butterflies, the monarch or milk-weed butterfly, you should visit the clusters of milk-weed along the roadside or anywhere, in the forenoon of a sunny July or August day. A few butterflies are probably flitting about in rather casual fashion. Watch them light on the leaves, mark the leaf with your eye and hurry to the spot. Search well. The tiny speck of pale yellow may be a drop of milk but if it stands up on the leaf it is likely to be a butterfly's egg. Your lens will tell you. Having made sure of one you will find others. You may find a young caterpillar lunching on the leaf. If just out of the egg it is a dull lead colour, but when half grown a young monarch is striped with rings of greenish yellow and black. Though handsome as to colour scheme, this caterpillar has manners unbecoming a plain citizen, let alone a monarch. Touch its back with a grass stem and see what happens.