356 



C.. 

 H.. 



N . 



Mr. G. F. Em< i \ . 



Ethylphyllotaonin. 



Calculated. 



Found. CH,,N,0,(OC,H,). C^HwNj 



69-22 69-84 69'32 



6-04 6-35 5-91 



11-40 11-11 11-55 



[Apr. 19, 



69'54 



6-19 



11-32 



C.. 

 H.. 



Found. 



67-95 



6-17 



Acetylphyllotaonin. 



Calculated. 



C M H 19 N,0 2 (OAc). 

 67-34 

 5-61 



68-01 

 5-53 



C 41 H 4l N.O & (OAi 



5-82 



VI. " Thermo-electric Properties of Salt Solutions." By GEOI 

 FREDERICK EMERY, B.A., LL.M., of the Inner Temple, 

 Scholar of Trinity College, Cambridge. Communicated 

 Professor J. J. THOMSON, F.R.S. Received February 

 1894. 



The thermo-electrical properties of solutions have not hithe: 

 received much attention from physicists. If we form a circuit of t 

 substances, one a metallic wire and the other a solution, and ar 

 it so that the junctions between the metal and the liquid are 

 different temperatures, we generally find that an electromotive fi 

 is developed in the circuit which varies in magnitude nearly in 

 portion to the difference of temperature between the junctions, 

 which, in comparison with the ordinary thermo-electromotive fo 

 in metallic circuits, is very considerable. Up to the present time, 

 far as I am aware, the only extensive measurements of such the 

 electric forces are those of M. Bouty (' Journ. de Phys.,' vol. 9). 

 concludes that for a given difference of temperature between 

 junctions when the metal is constant the E.M.F. is nearly in 

 pendent of the nature and strength of the solution (the solution bei 

 of some salt of the metal used). 



The object of my experiments has been to see how far this is t 

 and to find out how (in the event of its not being strictly true) t 

 E.M.F. varies with variations both in the strength and in the nat 

 of the solution. The results show that both have considerable 

 fluence on the magnitude of the E.M.F. 



My method of observation is as follows : the solution to be examin 

 is put in a (J-tube (fig. 1; A), in each limb of which is one of the 

 ends of metal, which we may for convenience call electrodes, BB. 



lure 



": 



med 





