INSECT BREEDING. 



179 



diameter of the cylinder should he about one 

 inch less than that of the saucer. The gallipot 

 to hold the water, in which the stems of the food- 

 plant are to be placed, should fit on the outside 

 of the rim of the saucer. The apparatus is now 

 complete and appears as in fig. 2. When the 

 food requires changing, invert the cylinder with 

 saucer (fig. 3) ; cut off the ends of the plant 



Fig. 3. 



which have been in the water, and replace the 

 saucer on the gallipot, leaving the food and larvae 

 in the cylinder ; then put in the fresh food through 

 the hole in the saucer, and replace the cylinder 

 without removing the larvae, which will as a 

 matter of course crawl from the old to the fresh 

 food. The withered plant can be removed after 

 a time without disturbing the larvae. 



