468 Report op the Entomologists of the 



conducted in the insectary at the Station and in one of the large 

 frost proof cellars of the Chase Nursery Co., at Rochester. The cel- 

 lar is 80 feet long, 40 feet wide and 16 feet high. This was filled 

 with fruit trees of all varieties and fumigated with hydrocyanic 

 acid gas. Before the gas was generated, twigs infested with the 

 woolly aphis and the pistol-case-bearer were placed in different 

 parts of the cellar including the remotest parts and under some 

 of the piles of trees. The trees were exposed all night, fourteen 

 hours. The temperature in the cellar, was a little above freezing. 

 The twigs were carefully examined and all of the lice were dead. 

 The pistol-case-bearers are apparently dead, but are being kept 

 in the insectary awaiting results when it becomes time for them 

 to revive. 



