ELECTRICAL MEASUREMENT. 425 



and that is the evanescence of electrical force in 

 the interior of a conductor. Both kinds of 

 measurements were practised by Cavendish in 

 a very remarkable manner, and I look forward 

 with great expectation to the results we are soon 

 to have of Cavendish's work. One most interest- 

 ing result which will follow from the Cavendish 

 laboratory in Cambridge from its director 

 Professor Clerk Maxwell and from the relation- 

 ship thus established between the physical 

 laboratory of the University of Cambridge, and 

 its director on the one hand, and the munificent 

 founder of the institution, the Duke of Devonshire, 

 on the other hand, is this : the Cavendish manu- 

 scripts which still remain in that family, being, 

 i believe, at present in the possession of the 

 Duke of Devonshire, have been by him put into 

 the hands of Professor Clerk Maxwell for the 

 purpose of having published either the whole, 

 or such extracts from them as may be found to 

 be of scientific interest at the present day. The 

 whole of them, no doubt, had great scientific 

 interest at one time. A large part of these manu- 



