-7- 



The following are illustrations of the reading of 

 the above table. Solution P.2S3 is characterized b;' having 

 two-eighths of all its salt molecules added in the form of 

 the potassium salt, three-eighths in the form of the calcium 

 salt, and twa-eighths in the form of the magnesiiim salt. 

 Solution R2S1 has two molecules of the potassium salt, one 

 of the calcium salt and five of the magnesium salt. In 

 reading these symbols, it may be remembered that the number 

 following "R" tells how many eighths of all the salt mol- 

 ecules in any voliime of the given solutions are in the 

 form of the potassium salt, while the number following the 

 "S" tells how many eighths are in the form of the calcium 

 salt. The difference betv/een the sum of these two numbers 

 and 8 gives the number that! have the form of the magnesium 

 salt. 



It was planned that work should begin by employ- 

 ing solutions having a total salt concentration such as 

 would give in all cases a calculated osmotic value of about 

 1.00 atmosphere of osmotic pressure at 25^C. Other total 

 concentrations were to be tested in later work. 



For further details regarding this series of 

 126 different three -salt solutions, the reader should refer 

 to the plan cited above. The experiments to be reported in the 

 present paper were planned as a part of the cooperation just 



