250 KANSAS UNIVERSITY SCIENCE BULLETIN. 



TABLE A.— CANE SUGAR. 

 Barometric variation, 1 mm. Variation of room temperature, 3.6^. 



TABLE B.— UREA. 



Barometric variation, .68 mm. Variation of room temperature, 1.3°. 



tration of 26.8 g. Dieterici/ however, lias concluded from 

 his freezing-point determinations that the molecular lower- 

 ing of the vapor tension of both cane sugar and urea in- 

 creases with the concentration, between 0.1 and 1.0 normal ; 

 while, according to these results, the molecular lowering of the 

 vapor tension in the case of urea decreases from a concentration 

 of 3.03 g. per 100 c.c. to 7.53 per 100 c.c. (from .52 to 1.3 

 normal ) , and then increases. There is an apparent increase 

 for concentrations less than 3.03 in the case of urea, shown by 

 only two readings ; and an apparent decrease in the case of cane 

 sugar at a corresponding point. The first reading in each set 

 of readings cannot be depended upon, however, as the probable 

 error is large. The first reading, in most cases, seems to be 

 abnormal when compared with the rest of the readings in the 

 same series. 



4. Wied. Ann., 62, 616 (1897). 



