Solution of Atmospheric Nitrogen and Oxygen by Water. 337 



The table shows the results of the experiments treated in 

 this way. 



i 



Values of "a." 





No. of 















Experiment. 





In per cent. 



Values of "b. 





In ccs. per min. 



of Saturation 

 per inin. 





12 



•645 



31-3 



•3131 Distilled 

 ■319/ water. 



13 



•675 



319 



14 



•685 



322 



3--21 Vartry 

 •327 J water. 



15 



•687 



327 



16 



•510 



30-0 



•300 i Sea- 

 •;300 J water. 



17 ' 1 



•510 



30-0 



Taking the mean of the results in the case of sea water and 



distilled water, we arrive at the formula -j- =30 s 8 — *308w, 



at 



which gives the rate of re-aeration, in percentages of saturation 

 per minute, for an exposed area of 56 sq. cm. 



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 in- 

 debtedness 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, 



Royal College of Science for Ireland. 



