Report ok the State Geoi>ogist. 683 



The perfected insect lays its eggs on the under side of the 

 leaves, generally beside the veins, but sometimes in clusters. 

 In from six to eight days, according to the weather, they 

 hatch, and commence feeding. They continue their work 

 upon the bushes, unti] they are bare of leaves, and then, 

 vfhether fully grown or not, go down into the ground and 

 form little black pupjy, varying in size according to the way the 

 worm is fed. Emerging in about two weeks, they lay '.heir 

 second brood, which pass the pupa state in the ground as 

 before, but do not emerge until the following spring. Pow- 

 dered white hellebore is, perhaps, generally used for their 

 destruction, but is no better than any other dust. Any dust 

 that touches them is lodged in their spiracles, or breathing- 

 pores, and soon produces death. Dust from the road, dried 

 fine plaster of Paris, or any finely pulverized substance, will 

 answer. The Grafton fertilizer, which was finely pulverized 

 quartz, was tlie best material I ever saw for killing them. 

 It possessed the requisites of great fineness and perfect dry- 

 ness, so it would make a dust easily. The hellebore is an 

 excellent preparation for the purpose, but might poison the 

 fruit. Gum aloes is, when fine, equally penetrating, and 

 less dangerous. 



Cabbage Wokm. 

 Pieris rajxje. 



Twenty years ago this centennial year, this obnoxious Eu- 

 ropean insect landed in Quebec, and from that beginning 

 has made itself familiar with not only New England, but 

 most of the United States, as well as Canada. 



It is susceptible to the dust treatment, but as that gets 

 into the cabbage head and injures it, it cannot be used to 



