1 8 8 2 .] Entomology. ion 



In the first case a good-sized vigorous individual was dropped 

 into the bottle, the vessel fully charged and the openings shut. 

 The hostile atmosphere quickly affected the insect ; after a feu- 

 exertions to break its way out, it fell over, opening the elytra? and 



ing, it remained for a long time motionless. In an hour these move- 

 ments were more noticeable, The beetle remained here for ten 

 hours longer at the end of which time it was kicking, and after 

 the least possible admission of air which failed to elicit any signs 

 of relief from its fellow prisoners, commenced to walk. It was 

 taken out in twenty-four hours, and revived so thoroughly as to 

 appear actually unharmed. ' 



In a second case several individuals apparently succumbed at 

 once, but in twelve hours recovered partially and crawled around, 

 and after remaining m the gas almost two daws, were removed, 

 and were active and lively. These were then introduced into an 

 atmosphere of carbonic acid anhydride, in which they remained 

 four hours, and then eventually recovered, when refreshed by air 

 and food. 



The snapp I very inferior power of 



resistance to the noxious effects of the gas, reviving in one case, . 

 but feebly in twenty-four hours, and in another found dead in 

 thirty hours. 



Moths {Noctua—) died in twenty minutes, though instantly 

 upon introduction, were thrown on their backs and paralyzed. 



A black wasp (/ >om/>i w/ ■ isciatus died in ten minutes. 



Carbonic Acid Anliydridc—Vlics {Mnsca domcstica) were in- 

 stantly overcome, and died in from ten to fifteen minutes. 



A large blue fly, bluebottle fly {Mnsca ccesar) was in a dying 



Colorado beetles recovered after three hours exposure during 

 which time they remained upon their backs almost motionless. 

 The surprising vitality of those previously exposed to hydrogen 

 has been given above. 



Bed-bugs {Cimex lectularius) also recovered to a slight degree 

 after two hours' exposure. 



Carbonic Oxide.— Colorado beetles revived after remaining in 

 this virulent atmosphere eight, twenty, thirty and forty-five min- 



Ants {Formua rubra) died in thirty seconds and in one minute. 



Prussia Acid Vapors.— This poisonous atmosphere acted fatally 

 upon every insect exposed to it, though the indestructible Colo- 

 rado beetle resisted its attacks more stubbornly than any other 

 experimented with. 



Nitrous Acid Fumes.— These fumes acted with fatal rapidity, 

 and destroyed without perceptible distinctions in the time of their 

 death the feebler and stronger insects. 



Chlorine— Chlorine corrodes a.;. tissues; and 



