1895.] Mr E. H. Griffiths, On the 'Volume Heat' of Aniline. 305 



Table II. 



It would thus appear that the " volume heat " of aniline over 

 the above range is practically constant. 



Of course it would be useless to found any hypothesis on an 

 isolated fact of this kind, and (for the reasons above given) I know 

 of no other body to which the enquiry can, at present, be extended. 



Where our knowledge is so small, however, even a solitary 

 example may be of use as indicating the direction in which inves- 

 tigation may be profitable. 



(3) Exhibition of Goldstein's Experiments on Kathode Rays. 

 By J. W. Capstick, M.A., Fellow of Trinity College. 



Mr Capstick shewed Goldstein's experiments on the effect of 

 a stream of kathode rays on salts of the alkalies. When the rays 

 are directed on potassium chloride, for instance, the salt becomes 

 of a heliotrope colour and retains the colour for several days if 

 kept out of contact with moisture. The effect appears to be due 

 to a chemical change in the substance — probably the formation of 

 a subchloride — but the layer of altered salt is so exceedingly thin 

 that it is difficult to get unequivocal chemical evidence as to its 

 nature. 



(4) On a curious Dynamical Property of Celts. By G. T. 

 Walker, M.A., Fellow of Trinity College. 



Mr G. T. Walker exhibited celts which possessed the property 

 of spinning in only one direction upon a horizontal surface. He 

 pointed out that the peculiarity was due to the fact that the 

 direction of the line of least curvature at the point of contact did 

 not exactly coincide with that of either of the axes of dynamical 

 symmetry, and exhibited a dynamical top in which this deviation 

 from parallelism could have any value assigned to it. 



VOL. VIII. PT. V. 23 



