CANE SUGAR. 



129 



In Series III, on the other hand, an attempt was made to maintain 

 a specific temperature, namely, that of melting ice. It was not entirely 

 successful, but the fluctuations were much smaller than in Series I and 

 II. The bath which was employed was the large rectangular one pre- 

 viously described. To prepare it for use in Series III, all the machinery 

 was removed except that concerned in the circulation of the water, 

 and all the space in both compartments, except that actually required 

 for the cells and manometers, was filled with crates for the storage of ice, 



Table 18. — Cane sugar, Series III. Temperatures of bath; loss in rotation; observed osmotic 

 pressures; and calculated gas pressures of the solute. 



Concentration. 



Temperature. 



0.1 



< t 



1 1 

 ii 



0.2 



II 



0.3 

 0.4 



u 

 II 



i I 



0.5 



it 



it 



0.6 



0.7 



il 



0.8 

 0.9 

 1.0 



degrees. 

 0.18 to 0.36 

 0.14 0.26 



0.14 

 0.14 

 0.16 

 0.28 

 0.18 

 0.14 

 0.16 

 0.22 

 0.26 

 0.12 

 0.14 

 0.20 

 0.12 

 0.16 

 0.16 

 0.20 

 0.16 

 0.14 

 0.16 

 0.16 

 0.30 

 0.15 

 0.16 

 0.20 

 0.26 



0.38 

 0.38 

 0.26 

 0.31 

 0.34 

 0.18 

 0.22 

 0.33 

 0.34 

 0.16 

 0.38 

 0.26 

 0.18 

 0.28 

 0.28 

 0.25 

 0.32 

 0.16 

 0.26 

 0.26 

 0.33 

 0.25 

 0.30 

 0.34 

 0.26 



Calculated 



gas 

 pressure. 



2.23 



4.46 



6.69 

 6.68 

 8.91 

 8.92 



i i 



8.91 

 11.14 



13.37 

 15.60 



1 1 



17.82 



20.06 

 20.05 



22.28 



il 



22.29 



Ratio. 



> 1.0S3 



• 1.071 



• 1.061 



- 1.048 



> 1 . 054 



■ 1.056 



• 1.069 



• 1.075 



> 1.091 



• 1 . 092 



Sum = 27.65 = 6 . 75 atmospheres. Mean =1.070 



which, when full, contained about 150 kilograms. The water in which 

 the ice in the lower half of the crates was immersed was kept in circu- 

 lation in the usual manner, and its level was maintained by means of 

 an automatic siphon. It was hoped to secure, by this arrangement, a 

 temperature very close to 0°, but the table will show that the temper- 

 atures actually maintained were all higher than that. 



The fluctuations in bath temperature were much smaller in Series III 

 than in Series II. This, however, does not prove that any progress had 



