ipo 



REPORTS OF INVESTIGATIONS AND PROJECTS. 



Table 3. — Glucose. Results for Bach Concentration. 



Ratio of A to 1.84= 1.044. Mean ratio = 1.052. 



point of water. The conclusion which was reached with respect to this rela- 

 tion was stated in the following words: 



It appears to have been established by the results published in this paper 

 and the preceding one that, in the vicinity of the freezing-point of the sol- 

 vent, both glucose and cane-sugar solutions exert osmotic pressures which 

 differ from the calculated gas pressures in about the same degree that the 

 observed depressions of the freezing-points of such solutions differ from those 

 which are calculated by means of the value 1.85. 



In view of this conclusion, it is now important to measure, in the vicinity 

 of 0°, the osmotic pressures of the solutions of some substance of which the 

 observed molecular depression of the freezing-point is approximately 1.85. 

 It is to be anticipated that such solutions, in the vicinity of the freezing- 

 point of water, will be found to exhibit osmotic pressures more in accord 

 with the calculated gas pressures than are those of glucose and cane sugar. 

 We shall undertake this as soon as we have succeeded in suppressing dilution 

 in the cell. 



Attention is called to table 4, which brings out clearly the mutual relations 

 of glucose and cane-sugar with respect to the osmotic pressures and freez- 

 ing-points of their equivalent solutions. 

 If we represent by 



P, the osmotic pressure of glucose, 

 /*j, the osmotic pressure of cane-sugar, 



A, the observ^ed molecular depression of the freezing-point of glucose, 

 Aj, the observed molecular depression of the freezing-point of cane-sugar, 

 7?, the ratio of osmotic to gas pressure for glucose, 

 /?,, the ratio of osmotic to gas pressure for cane sugar, 

 then proportions, such as the following, should be found to hold approxi- 

 mately : 



I. /':/'i : : A : A, : 2. i^ : i?, : : A : A, 



3. /? : i^, : : 



1.85 ' 1.85' 



etc. 



