In selecting the Apple-tree Tent Caterpillar for this lesson we have been guided by the following facts: First, it is to be found in early spring; second, its life-history from egg to cocoon is accomplished within the limits of the spring term of our schools; third, it is common everywhere; fourth, it is an important insect from an economic point of view, and the children may be taught how to keep it out of the orchards, thus making the lesson of practical use. In this lesson the teacher is encouraged to use her own methods and originate new ones to make the work interesting. The Leaflet is meant for the exclusive use of the teacher and the text should not be shown to the pupils. The pictures on page 235 are to be shown to the pupils at the teacher's discretion. When answers are herein given to the questions asked, they are meant to aid the teacher in drawing out the correct replies from the children. MATERIALS NEEDED. 1. A pocket lens or a tripod lens is desirable, but not a necessity. These lenses may be bought from or ordered through any jeweler or bookseller. They cost from twenty-five cents to one dollar each. It is worth while for any teacher to possess one of these magnifiers as a means of interesting her pupils in many things. 2. A bottle, a broad-bottomed one being preferable so that it will not tip over easily. This bottle is to be filled with water in which a small branch of the apple tree may be placed to keep it fresh. A common ink bottle will do to begin with. Fig. 147. 3. A wooden or pasteboard box, twelve or fourteen inches square,--a soap box or hat box will do. In place of a cover, nail or paste mosquito netting or cheese cloth over the top; remove the bottom so that the box may be placed over the bottle and the branch of apple in it. This is called a "breeding-cage," and its use is to keep the insects from straying about the schoolroom. 4. A twig bearing the egg-mass of the tent caterpillar. These are easily found before the leaves appear on the apple tree or the wild cherry tree. [Illustration: _Fig. 147. The bottle with the twigs bearing the egg-masses. The tent is being woven below._] METHODS OF USING THE LEAFLET.