CHEMISTRY — MORSE. 

 Table i. 



219 



Table 2. 



Table i gives the osmotic pressures which were observed, and table 2 the 

 ratio of these to the corresponding calculated gas pressures. It will be ob- 

 served, on referring to table 2, that the ratios for each concentration are 

 constant to the third decimal place, which would seem to establish sufficiently 

 the fact that up to 25° the law of Gay-Lussac for gases applies also to the 

 osmotic pressure of cane-sugar solutions. A possible exception will be noted 

 in the case of the one-tenth normal solution at 0°, where the ratio of osmotic 

 to gas pressure was found to be 1.106 instead of 1.083, ^s in the case of the 

 same solution at 5°, 10°, 15°, 20°, and 25°. This apparent anomaly makes 

 necessary a careful investigation of more concentrated solutions at tempera- 

 tures very near their respective freezing-points ; i. e., at temperatures below 

 0°. The question is whether other solutions than that cited above undergo 

 an apperent concentration just above their freezing temperatures. 



Much attention has been given during the past year to testing in various 

 ways the validity of the results which were being obtained. Two lines of 

 investigation of this character may be mentioned : 



(i) In nearly every experiment hitherto reported the initial pressure in 

 the cell has been less than the ultimate or osmotic pressure. The question 

 was to be answered, whether the same ultimate pressure would be obtained 

 if the initial pressures were higher than the final ones. It has been shown 



