Sulphuric, then Hydrochloric and Sulphurous acids in order, 
the action of the two latter being much more distinctly 
marked than the action of the former. 
In making observations on the amount of free acid 
required to prevent origination of life it is found that the 
order of acid is the same as above, but that the line is much 
more sharply drawn. 
TABLE IV. 
Experiments on the amount of Free Acicl contained in Water in which Animal 
Life can originate. 
SULPHURIC ACID ADDED. 
Time allowed 
to stand. 
Days. 
Total Acidity. 
Grrns. per Litre. 
Remarks. 
8 
0-070 
Life abundant. 
20 
0-074 
Little or no life. 
2G 
0-080 
No life. 
TABLE V. 
HYDROCHLORIC ACID ADDED. 
Time allowed 
Total Acidity. 
to stand. 
Grins, per Litre. 
Remarks. 
Days. 
5 
0-0085 
Life abundant. 
8 
0-009 
No life. 
Water acidified with 0 - 0025 grins. Sulphurous acid per 
litre was allowed to stand exactly under the same conditions 
as the former to see if life could originate in water contain- 
ing that amount of acidity, but after standing twenty-one 
days no life was visible. 
