Determining the Vapour Pressures of Solutions. 



385 



in level. Another (G) is made, proportional to the swing of the gal- 

 vanometer, if the observer has failed to procure an exact balance at 

 the fifteenth minute. 



§ 6. Conclusion. 



This paper professes to be no more than a description of the 

 method employed in obtaining the results.* I must therefore post- 

 pone till a later occasion all discussion of the precautions employed 

 and of the accuracy obtainable. In conclusion, I wish to acknow- 

 ledge my indebtedness to Mr. Griffiths for much invaluable assistance, 

 and to Professor Thomson for permission to work in the Cavendish 

 Laboratory. 



February 17, 1898. 



SIR JOHN EYANS, K.C.B., D.C.L., Treasurer and Vice-President, 



in the Chair. 



A List of the Presents received was laid on the table, and thanks 

 ordered for them. 



The following Papers were read : — 



I. " On the Connection between the Electrical Properties and the 

 Chemical Composition of different kinds of Glass." By 

 Professor Andrew Geay, LL.D., F.R.S., and Professor J. J. 

 Dobbie, M.A., D.Sc. 



II. "On the Magnetic Deformation of Nickel." By E. Taylor 

 Jones, D.Sc. Communicated by Professor Andrew Gray, 

 F.R.S. 



III. " Upon the Structure and Development of the Enamel of Elasnio- 

 branch Fishes." By Charles S. Tomes, M.A., F.R.S. 



IY. " On artificial temporary Colour-blindness, with an Examination 

 of the Colour Sensations of 109 Persons." By George J. 

 Burch, M.A. Communicated by Professor Gotch, F.R.S. 



Y. " Contributions to the Mathematical Theory of Evolution. On 

 the Inheritance of the Cephalic Index." By Cicely Fawcett 

 and Karl Pearson, F.R.S. 



* < Eov. Soc. Proc,,' vol. 61, pp. 235—287. 

 VOL. LXIL 2 F 



