196 



American Fisheries Society 



Table III. 



RESISTANCE TO ACID WATER. 



(100 c. c. of tenth normal alkali required to neutralize 

 one liter of sea water, — phenolphthalein indicator.) 



Here the relative resistance of individuals from differ- 

 ent depths is reversed ; those from the deeper water lose 

 their equilibrium later than those from the shallow water. 

 Death follows after irregular intervals. 



(41. 



Table IV. 



RESISTANCE TO ALKALINE WATER. 



c. c. of tenth normal acid to neutralize one liter, — 

 methyl orange indicator.) 



As in the case of the acid water the animals from 

 deeper water are more resistant. There are some varia- 

 tions and irregularities, and while the experiments with 

 acid and alkaline water were not extensive they indicate 

 the reverse of the results with fresh water and high 

 temperature. 



