153 Scientific Proceedings, Royal Dublin Society. 



During the experiment 7'935 grams water were evapoi-ated. 



It will be seen from the above figures that, while the water in the upper 

 bulb was only a little more than half saturated, that in the lower bulb was 

 also very nearly half saturated. That is, the air-content of the water was 

 practically uniform, although the surface layer was not saturated. And 

 the figures consequently prove that, while the dissolved gases were freely 

 drawn down the connecting tube into the lower bulb by gravitation, they 

 showed no tendency to spread in lateral directions in the upper bulb during 

 their downward passage through it.^ 



The authors desire again to express their indebtedness to Dr. Hackett 

 for the interest that he has continued to take in their investigation of the 

 subject of this and previous communications. 



1 See Phil. Mag., March, 190.5. 



