of Dilute Solutions of Cane-Sugar and Ethyl Alcohol. 387 



was considerable. A few solutions of ethyl alcohol were also 

 investigated under the same conditions as those employed for 

 cane-sugar. To the results obtained for this compound Nernst 

 and Abegg introduced no correction. 



The cane-sugar used was a beautifully crystallized sample, 

 which was shown by analysis to be free from inorganic matter 

 and from dextrose. A one-half normal solution was prepared 

 each day from a carefully dried specimen, and in no case was 

 a solution used which had been made up more than twenty- 

 four hours. 



In the first series of measurements, a freezing-mixture of 

 such temperature was employed that the air-bath surrounding 

 the solution whose freezing-point was to be determined was 

 at no time colder than —5°. The apparatus used was essen- 

 tially that employed hitherto by myself*, and the method of 

 woik that already described. The stirring was carried on 

 very slowly and regularly, and a comparatively large amount 

 of ice was allowed to separate from the solution before the 

 reading was taken on the thermometer. 





First Series of Measurements. 







C 12 H 22 O n = 342-ll. 





Grams in 

 litre. 



Normal Lowering 

 JNoimal. found> 



Grani-mol 

 Lowering 



7-775 



0-0227 00493 



2-17 



15-550 



0-0455 0-0961 



2-11 



23-325 



0-0682 0-1397 



2-05 



31-100 



0-0909 0-1792 



1-97 



A second series was then made with cane-sugar, where 

 the air-bath surrounding the solution was never colder than 

 — 4^°. The solutions were all stirred very gently, and 

 considerable time was allowed for the thermometer to reach 

 a point of equilibrium. 





Second Series 



of Measurements. 





Grams in 

 litre. 



Normal. 



Lowering 

 found. 



Gram-mol. 

 Lowering. 



7-775 



0-0227 



°-0497 



2-19 



15-550 



0-0455 



0-0958 



2-11 



23-325 



0*0682 



0-1399 



2-05 



31-100 



0-0909 



0-1796 



1-98 



The gram-molecular lowerings found in the two series 

 * Zeit. f. pht/s. C/iem. xi. p. 532. 



