424 Dr. A. M. Tyndall on the Spread of the 



Table V. 



Liquid. 



IT (21). 



■n (13). 





912 

 1042 

 1315 



686 



1102 





1188 





1176 





G61 







If in equation (20) use is made of (18) we get 

 7T = I — «7rT, 



whence 



IT 



I 



1 + «T 



1+.7 



T 



2T.-T 



(24) 



2*T C 



(25) 



This equation should be practically equivalent to (20). 



In this paper only liquids which are not associated have 

 been considered. 1 hope to deal with associated liquids in a 

 future paper. 



In conclusion I wish to express my warmest thanks to 

 Prof. Porter for his corrections and suggestions and for the 

 kindly interest he has taken in my work. 



XXXVII. On the Spread of the Discharge from an Electrified 

 Point. By A. M. Tyndall, D.Sc, M.Sc, Lecturer in 

 Physics in the University of Bristol *. 



rjlHE following experiments were originally undertaken 

 L with the view to test the hypothesis that there is in 

 discharge between a point and a plane at atmospheric 

 pressure, a back discharge from the plate which is neg- 

 ligible in amount only for very small currents. It has been 

 found, however, that the method employed does not give 

 definite evidence for or against the Irvpothesis for reasons 



* Communicated by the Author. 



