BIBLIOGRAPHY 125 



wise live therein for weeks, is sufficient to kill the animals in a 

 few hours. 



A large number of other substances were also quantitatively 

 tested by Bredig and his co-workers as to their action upon the 

 catalytic power of colloidal platinum. Thus so little as one part 

 of sulphuretted hydrogen in 300,000,000 parts showed clearly a 

 retarding effect upon the catalysis. The colloidal platinum is 

 capable of recovery from the action of some of the reagents em- 

 ployed and not from others. Thus if a stream of air be passed 

 for some time through a solution of colloidal platinum which has 

 been rendered inert by addition of a trace of hydrocyanic acid, 

 so as to remove the latter, the activity is again restored. 



Bredig states that recovery can take place from hydrocyanic 

 acid, carbon monoxide, phosphorus, hydroxylamin, but not from 

 cyan-iodide, iodine, sublimate, or arseniuretted hydrogen. 



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