IN WATER CONTAINING FREE ACIDS. 



191 



Table III. — Acid used, Sulphurous Acid. 



Time allowed 

 to stand. 



Total acidity. 



Eemarks. 



days. 



5 

 6 



7 

 8 



grm. per litre. 



0'002 



0-004 



O'OI 



Life very abundant. 



Rotifers more active, causing great dis- 

 turbance in liquid. 



Life sluggish ; Rotifers not inclined to 

 move. 



After three hours all life extinct; no 

 obvious action on the bodies of the 

 animals. 



Experiments on the Amount of Free Acid contained in 

 Water in which Animal Life can originate. 



Table IV. — Acid used, Sulphuric Acid. 



Time allowed 

 to stand. 



Total acidity. 



Remarks. 



days. 

 8 



20 

 26 



grm. per litre. 



0*070 

 0-074 

 0*070 



Life abundant. 

 Little or no life. 

 No life. 



Table V. — Acid used, Hydrochloric Acid. 



Time allowed 

 to stand. 



Total acidity. 



Remarks. 



days. 



5 

 26 



grm. per litre. 

 0*0085 

 0*009 



Life abundant. 

 No life. 



