404 Scientific Proceedings, Royal Dublin Society. 



The table shows the results of the experiments treated in this way. 



Taking the mean of the results in the ease of sea-water and distilled 



water, we arrive at the formula -=- = 30'8 - SOSiv, which gives the rate of 



re-aeration, in percentages of saturation per minute, for an exposed area 

 of 56 sq. cms. 



Fig. 8. 



These figures represent the mean effect over the area exposed. 



Experiments are being made with bubbles of various sizes, and it is 

 proposed to deal with these in a further communication. 



The authors desire, in conclusion, to express their indebtedness to 

 Dr. Hackett, Lecturer in Physics in this College, for the advice and assistance 

 that he has generously given them in the mathematical treatment of the 

 subject of this communication. 



Chemical Department, 



Eoyal College of Science for Ireland. 



