REARING ANIMALS AND MAKING COLLECTIONS 459 



breeding-cages, or the moss if that be used. The cages 

 or boxes containing the pupae should be stored in a cool 

 cellar, or in an unheated room, or in a large box placed 

 out of doors where the sun cannot strike it. Low tem- 

 perature is not so much to be 

 feared as great and frequent 

 changes of temperature. 



' ' Hibernating pupae can be 

 kept in a warm room if care be 

 taken to keep them moist, but 

 under such treatment the mature 

 insects are apt to emerge in 

 midwinter. 



' ' An excellent breeding-cage 

 is represented by fig. 167. It 

 is made by combining a flower- 

 pot and a lantern-globe. When 

 practicable, the food-plant of 

 the insects to be bred is planted 



r FIG. 167. Lamp-chimney and 



in the flower-pot ; in Other Cases flower-pot breeding-cage for 



a bottle or tin can filled with s !f s - , ( From J enkins and 



Kellogg.) 



wet sand is sunk into the soil 



in the flower-pot, and the stems of the plant are stuck into 

 this wet sand. The top of the lantern-globe is covered 

 with Swiss muslin. These breeding-cages are inexpen- 

 sive, and especially so when the pots and globes are 

 bought in considerable quantities. A modification of this 

 style of breeding-cage that is used by the writer differs 

 only in that large glass cylinders take the place of the 

 lantern-globes. These cylinders were made especially 

 for us by a manufacturer of glass, and cost from six to 

 eight dollars per dozen, according to size, when made in 

 lots of fifty. 



4< When the transformation of small insects or of a small 

 number of larger ones are to be studied, a convenient 



