THEIR NATURE AND EFFBCTiS. 127 



of which it was desired to ascertain. The mixture was 

 then hermetically closed in a glass tube and allowed to 

 remain for twenty hours, and the solution was then 

 tested physiologically. In the case of gaseous disin- 

 fectants, one cubic centimetre of the officinal solutions 

 of these gases were used. The following are the times 

 that the mixed solutions required to cause death in 

 fowls : — 



One centigramme (•154 grain) of cobra-poison alone, 

 twenty minutes. 



With sodium hyposulphite, twenty-four minutes. 



With carbolic acid, thirty-six minutes. 



With ferrous sulphate, forty-six minutes. 



With solution of chlorine, fifty- three minutes. 



With solution of sulphurous acid, sixty-five 

 minutes. 



With zinc chloride, ninety minutes. 



With permanganate of potash, caused no symp- 

 tom. 

 In this list it is seen that in every case there was 

 some retardation of the symptoms, ferrous sulphate, 

 chlorine, sulphurous oxide, zinc chloride, each pro- 

 ducing considerable weakening of the poison. Carbolic 

 acid caused very slight delay, and its use was attended 

 with its own special toxic symptoms. In no other case 

 was there the least change in the nature of the symp- 

 toms. By only one re-agent— namely, potassium 

 permanganante — was the poison completely destroyed. 



