54 



THE ROYAL SOCIETY -QF CANADA 



Liquid 



Highest 

 temp. 



Vapour 

 pressure 



Boiling 

 point 



Association 

 coefficient 



Ethyl ether 



Ethyl alcohol 



Methyl alcohol. .. 



Chloroform 



Acetone 



Carbon bisulphide 



Water 



Sulphur dioxide. . . 



Benzene 



Chlorobenzene. . . . 

 Bromobenzene. . . . 



Aniline 



m-Xvlene 



143 

 201 

 180 

 173 

 174 

 168 

 270 

 50 

 203 

 250 

 261 

 262 

 235 



11,500 mm. 



22,700 



20,100 



11,000 



14,400 



11,700 



41,200 



6,300 

 11,200 



8,300 



6,100 



35° 



78 



66 



61 



56 



46 



100 



10 



79 



132 



156 



183 



137 



1 



2.7 



3.4 



1 



1.3 



1 



2.3 to 3. 



1 



1 



A calculation of the amount of vapour in a bubble whose pressure 

 caused by surface tension would balance the above vapour pressures 

 leads to quantities about a hundred times greater than correspond 

 to the ordinarily accepted molecular dimensions. It is noteworthy 

 that liquids which can be heated to temperatures corresponding to 

 abnormally high vapour pressures are those which are abnormal in 

 having high association coefificients. 



Many rather indefinite results were also obtained which point 

 to the presence of nuclei both in the walls of the tubes and also in the 

 liquids themselves which initiate ebullition. 



(Under direction of Professor F. B. Kenrick) 



(8) Solubility of Crystal Faces; an l7ivestigation of the Equilibrium 

 Between Various Crystal Faces and Solution, with Special Reference 

 to Cubic and Octahedral Sodium Chloride. 



By E. G. Haas, B.S. and J. W. Russell 



Practically all evidence for difference in solubility of different 

 crystal forms of the same substance is based on determinations of 

 the rate of solution. In the present research an attempt is being 

 made to obtain direct evidence of difference in solubility which is 

 independent of rate measurements. Three ways are being tried to 

 settle whether a crystal is growing or dissolving: (1) Observation of 



