XVI INTRODUCTION. 



box. Put in this box some larva, say a potato worm ; feed 

 it daily with the leaves on which it was found feeding ; 

 keep the soil moist, and, if no change takes place before 

 cold weather, remove to a cellar and keep till spring. 

 Any good-sized glass jar will serve as a breeding cage, as 

 a candy jar, fruit jar, or battery jar, with a piece of tin 

 laid on as a cover. A jelly glass makes an excellent 

 breeding case for eggs and young larvae. 



APPENDIX TO INTRODUCTION. 



THE old-fashioned candy-jars serve admirably as aqua- 

 ria to be used in class work for the frog, minnows, 

 clams, snails, etc. It is very desirable to have one for 

 every student, or, at least, for every group of four at a 

 table. 



For dissecting-pans, glass candy-trays with plain sides 

 and level tops are excellent. Some trays have knobs at 

 the corners ; these prevent close covering of the tray with 

 a piece of glass, when a dissection is to be kept. For a 

 bottom, to which specimens may be pinned, use pieces 

 of shingle weighted by lead strips wrapped around the 

 ends. 



Instead of using mucilage, sew the parts of the grass- 

 hopper, crayfish, frog skeleton, etc., to cards. Many ani- 

 mals that are not to be dissected under water, such as the 

 pigeon, rabbit (or ground-squirrel, which serves well as a 

 type of mammals), may be most conveniently dissected on 

 a shingle. To it they can be pinned or tacked. If pin- 



