186 



Prof. W. Ramsay and Miss E. Astoii. [June 14, 



These results call for no special remark, except that, contrary to 

 the experiments of Ramsay and Shields, carbon disnlphide appears 

 to associate somewhat at low temperatures. Further experiments will 

 be made on this matter at still lower temperatures. The result given 

 here may be taken as reliable, for it was carefully repeated several 

 times, special precautions being taken to ensure the absolute purity of 

 the bisulphide, and using a different capillary tube. 



The densities were taken from the following sources : 



Toluene, Nasini and Pagliani, ' Jahresb.,' 1862, p. 63. 



Piperidine, Beilstein, ' Organische Chemie,' vol. 3, p. 616. 



Benzene, Kopp, 'Annalen,' vol. 64, p. 215. 



Carbon tetrachloride, Thorpe, ' Trans. Chem. Soc.,' vol. 37, p. 200. 



Chlorobenzene, determined by ourselves at the temperatures chosen. 



Ethylene dibromide, Thorpe, ibid., p. 197. 



Chloroform, ibid., p. 197. 



Carbon disulphide, ibid., p. 364. 



DETERMINATION OF THE CAPILLARY RISE OF MIXTURES. 

 I. Toluene and Piperidine. 



(a.) 5C 6 H 5 .CH 3 to 1C 6 H 10 :NH. 



In filling the tube with this mixture O'llS gram was lost out of a 

 total of 4 grams, or a little over 2 per cent. It may be assumed that, 

 owing to these liquids having so nearly the same boiling point, no 

 material alteration of their ratio is due to this cause. The density of 

 the mixture was assumed to be the mean of those of the constituents, 

 taken in the proportion in which they were present. As will be after- 

 wards shown, no appreciable error is involved in this assumption. 

 The values of h are the mean of four observations in each case. 



In the columns with the heading " calculated " the mean height, 

 surface-tension, and surface-energy have been inserted, together with 

 the mean values of k. 



o ICH IO :NH. 





