616 



Scientific Proceedings, Royal Dublin Society. 



water-jacket was widely different from that of the room, this method did not 

 give sufficiently accurate values for the saturation-point. 



In fig. 3, the mean values of b are plotted against temperature, giving 

 a straight line with the formula b = - 0075 (T - 2401). This will be referred 

 to when finally considering the results. 



Table VI. 

 Eesults of Experiments with Atmospheric Air. 



V. — Improvements in Methods of Experimenting. 



When the form of apparatus, described in Part I of this communication 

 was employed in experiments at temperatures much above or below room- 

 temperature, a number of possible sources of error might be expected to 

 affect the results, viz. : — 



1. Difference of temperature between the water-jacket and the air drawn 

 in to renew bubble, 



