li hilly and Hickinbottom — Volatile Fatty Acids. 521 



Kallmann and Miiller's constant (-) is C and, as we note from above, 

 C = 1 - B. 



Summary of relation between the constants. 



The distilling constant A is inversely proportional to the volume of 

 solution (V), and as the above table shows the constants A and B should 

 exhibit the same proportionality. This has already been demonstrated in 

 Tables 1 and 2. 



Several types of apparatus were tried in the endeavour to obtain uniform 

 conditions during distillation. The type finally adopted is shown on 

 Plate XLIX. In order to explain why certain modifications were introduced, 

 it will be necessary to refer to some earlier experiments. In these experi- 

 ments the solution was distilled from a round -bottomed flask, and the volume 

 was kept constant by introducing, by means of a dropping funnel, a measured 

 amount of cold water, through the neck of the flask. This method of keeping 



SOIENT. PROC. R.D.S., VOL. XV., NO. XXXVII. 



4 M 



