146 



Scientific Proceedings, Royal Dublin Society. 



lie as shown in figs. 1 and 2, and i^ will be seen that they are in fair agree- 

 ment with a logarithmic curve. Hence the results of these experiments can 

 be dealt with in a similar way to that used in previous papers. 



tsD 



20 



40 



60 



140 



80 100 120 



Time in Hours. 

 Fio. 1. — Eesiilta ol: experiments with tap-water. 

 Equation of this curve : — w = (100 - wi) (1 - c" ■°"" 



160 



180 



(h 



20 



40 



60 



80 



100 

 Time in Houus. 



120 



140 



160 



180 



Fig. 2. — Results of experiments willi sea-water. 

 Equation of this curve : — w = (100 - W\) (1 - e" ■'"° 



