CHEMISTRY — MORSE. 



189 



vicinity of 20°, glucose in aqueous solution can not be hydrated." A 

 similar conclusion had already been reached with respect to the state of cane- 

 sugar in aqueous solution, namely, that, in the vicinity of 20°, it also is 

 anhydrous. 



In the second paper it was shown that whereas in the vicinity of 20° 

 osmotic and gas pressures are about equal, in the vicinity of the freezing- 

 point of water the osmotic pressures of cane-sugar solutions are notably in 

 excess of the calculated gas pressures ; also that the divergence between the 

 two tends, in general, to increase with concentration. Table 2 is introduced 

 to illustrate these relations. 



Table 2. — Cane-sugar. Mean Values for Each Concentration. Series III. 



In a third paper an account was given of the pressures which glucose solu- 

 tions had been found to exert in the vicinity of the freezing-point of water. 

 These also were considerably above the calculated gas pressures, but the 

 divergence between the two was less than in the case of equivalent cane-sugar 

 solutions at the same temperature. Moreover, the pressures of glucose solu- 

 tions in the neighborhood of 0° were found, like those of both glucose and 

 cane-sugar in the vicinity of 20°, to be proportional to the weight of the 

 sugar which is dissolved in the fixed mass of water, which appears to prove 

 that, even at 0°, glucose in solution is in the anhydrous condition. The same 

 conclusion was drawn from the fact that the molecular depression of the 

 freezing-point of weight-normal glucose solutions was found to be a constant 

 value. Table 3 gives a summary of the results. 



Another matter which was brought out in the third paper is the relation 

 which has been found to hold for both glucose and cane-sugar solutions be- 

 tween the deviations of osmotic from gas pressures on the one side, and, on 

 the other, the deviations of the observed molecular depressions of the freez- 

 ing-points from 1.85, the calculated molecular depression of the freezing- 



