16 



With regard to the preservation of tlie larvas of insects, much ma}'^ 

 be said. It is important that collectors should preserve the larval forms 

 as well as the other stao-es of tlie insect for it should be borne in mind 



Fig. 15. A Simple Insect ( 



that those collections are of highest value educationally which show the 

 life history of the insect in all stages — the egg, the larva, the pupa and 

 the adult. The larval stage of the inject, moreover, should be carefully 



Fig. 16. A good ease with glass cover. Specimens not labelled. 



preserved throughout all its molts for the mature larva frequently differs 

 considerably from the younger forms. Some collectors place the lar- 

 vae in liquid in vials ; other prefer to inflate them and have them 

 placed on pins beside the adult forms. For school purposes, how- 

 ever, ihe vials are to be preferred. 



