20 



and if not left too long in the gas recovered with a similar but 

 inverted order of symptoms. The annexed table will best 

 illustrate this. 



No. 



1 young 



2 adult 



3 young 



4 adult 



5 " 



6 " 



7 " 



10 



Twitchings Motionless Remained Began Crawled 

 began at at in to move off at 



end of end of Oas again at end of end of 



1 m. 



1 m. 30 s. 



5 m. 



5 m. 15 s. 



42 s. 

 1 m. 15 s. 

 1 m. 



1 ra. 15 s. 

 1 m. 15 s. 



45 s. 



5 m. 



4 m. 



8 m. 



50 m. 



8 m. 

 20 m. 



9 m. 

 25 m, 

 13 m. 



4 m. 



10 m. 



5 ra. 

 10 m. 

 20 m. 

 30 m. 

 30 m. 

 30 m. 

 30 m. 

 30 m. 



5 m. 



22 m. 

 20 m. 

 25 m. 

 died 



50 m. 

 25 m. 

 40 m. 



45 m. 



55 m. 



Carbonic Dioxide, CO2, and Oxygen, O,. • In a mixture 

 of seventy-five parts by volume of carbonic dioxide and twenty- 

 five parts of oxygen, a specimen of Ajiisodaetylus lecontei Chd. 

 Avas rendered motionless in thirty seconds, remained in the 

 mixture three minutes, and recovered fully at the end of three 

 and three quarters minutes. In a mixture of sixty-six parts of 

 carbonic dioxide and thirty-four parts of oxygen, the following 

 results Avere obtained. 



Species. 

 Pterostichus caudicalis 

 Elaterid larva . . . 

 Zygogramma elegans . 



Specimens of Oniscus treated with the latter mixture contin- 

 ued to move much longer than was usual with the same species 

 when treated with pure carbonic dioxide, as the following table 

 will show. 



No. 



1 



2 

 3 

 4 

 5 



Began 

 twitching 



1 m. 15 s. 



2 ra. 



1 m. 45 s. 

 1 m. 45 s. 



3Iotionless Jlemained Began to move 

 in in Gas again at end of 



2o m. 

 35 m. 

 50 ra. 

 20 ra. 



2 m. kept twitchin<. 



50 m. 

 50 m. 

 50 m. 

 50 ra. 

 50 ra. 



died 



1 h. 30 ra. 

 1 1). 20 m. 



Crawled off 

 at end of 



3li. 10 m. 



2 h. 50 m. 



80 m. 



