850 



Dr. R. W. Boyle on the 



This table shows that the coefficient remains constant, 

 within experimental error, although the nature of the gas is 

 completely changed. Both tables show definitely that Henry's 

 law is yalid. 



(2) The Variation of the Solubility ivith Temperature. 



Experiments were carried out with air and distilled water 

 from 0° G. to 39°'l C„ the air containing the emanation 

 being at atmospheric pressure. At about 50° C. and higher 

 the same methods cannot be used, on account of the running 

 of the lubricant of the stopcock and breaking down of the 

 vacuum. The chief essential of the experiments is that the 

 vacuum in the sampling bulb should be maintained during 

 an experiment, otherwise the values obtained for the co- 

 efficient would be too high. The results are shown in 

 Table III., which gives only the means for the different 

 temperatures, but the range of temperature was traversed 

 twice. 



Table III. 



Temperature. 

 0° C. 



Coefficient. 



Temperature. 

 17-6° C. 



Coefficient. 



0-506 



0-280 



4-3 



0424 



20-0 



0-245 



5-7 



0-398 



26-8 



0-206 



10 



0-340 



31-6 



0-193 



14-0 



0-303 



34-8 



0-176 







35-2 



0-170 







39-1 



0-160 



From the figures of Table III. the solubility-temperature 

 curve is plotted and shown in fig. 2 (p. 851). The variation 

 with temperature is quite marked, and does not agree with 

 the former results published by Hofmann *, 



(3) The Solubility in other Liquids. 



The solubilities in a few organic liquids were measured. 

 In these cases stopcocks could not be used, for the liquids 

 dissolve the tap grease and thus cause the bulbs to leak. In 

 consequence, light pressure-tubing with screw-clips was 

 used instead of stopcocks. The tubing was secured to the 

 bulbs by wire and the joints were waxed so that on testing 

 the bulbs were quite airtight. A three-way tap, held between 



* Loc. cit. 



