CANE SUGAR. 



183 



Table 58. — Determinations of osmotic pressure at 80°. 

 W. N. S. = Weight normal solution. C. G. P. = Calculated gas pressure. 



0.8 W. N. S. at 80° 

 C. G. P. 23.041 . . , 



0.9 W. N. S. at 80° 

 C.G. P. 25.921. . . 



1.0 W. N. S. at 80° 

 C.G. P. 28.801. . . 



o 

 a 



o> 

 ft 



W 



o> 

 O 



B 6 

 E s 

 G 6 

 H 6 

 U 



a 



■ § 

 ° s 



m 



CO 



a> 



9,000 

 10,000 

 10,000 

 10,500 

 10,000 



u 

 0> 



43 



a 



o 

 a 



09 



24 

 31 



5 

 31 



lo 



» 



(-. 



3 



CO 



tn 

 <D 



L-. 

 ft 



33.00 

 26.85 

 23.96 

 30.20 

 28.19 



Observed mean daily total pressures. 



Second 

 day. 



29 . 838 



Third 

 day. 



29.811 



Fourth 

 day. 



20.905 

 26.974 

 29.801 



Fifth 

 day. 



Sixth Seventh 

 day. day. 



24.087 24.073 24.042 

 26.909; 26.914 26.919 

 26.933 26.909 26.873 



29.780 i 



29.770 29.863 29.836 



0.8 W. N. S. at 80° 

 C.G. P. 23.041. 



0.9 W. N. S. at 80° 

 C.G. P. 25.921. 



LOW. N. S. at 80° 

 C. G. P. 28.801 . 



Observed mean daily total pressures. 



-a 



xi 

 to 



24.036 



26.909 



29.799 



>> 



o3 

 X\ 



43 



a 



•F-t 



29.785 



>> 



03 

 H3 



a 

 H 





a 



o> 



> 



o> 

 H 



>> 



a> 



29.829 29.859 29.799 



V3 Ot 



O fa 



a s 



o £ 



03 

 tjQ 



03 



1.001 

 1.000 



1.000 



The results of the foregoing determinations of osmotic pressure have 

 been brought together in tables 59 to 63. Table 59 gives, for each con- 

 centration of solution and each temperature, the observed osmotic 

 pressure. Table 60 gives the means of the observed osmotic pressures 

 for each concentration and temperature. Table 61 contains the calcu- 

 lated gas pressure of the solute for all concentrations of solution which 

 were employed, and for all the temperatures at which measurements of 

 osmotic pressure were made — the volume of the gas being that of the solvent 

 in the pure state, and not that of the solution. Table 62 gives the ratios 

 of the observed osmotic pressures of the solutions to the calculated gas 

 pressures of the solute, i. e., the results which are obtained by divid- 

 ing the values in Table 60 by the corresponding values in Table 61. 

 In order to facilitate an interpretation of the results, Tables 60 and 62 

 have been divided into three sections by means of heavy lines. Attention 

 is called more especially to Table 62, in which are given the ratios of 

 osmotic to gas pressure. If the values on the various horizontal lines, 

 to the left of the vertical heavy line, are compared, it will be seen that the 

 ratio of osmotic to gas pressure, between 0° and 25°, is very nearly con- 

 stant for each concentration of solution. Omitting the ratio for the 0.1 

 weight-normal solutionat 0°, the means of the ratios for the various con- 

 centrations are given in Table 63. 



