out entering the room. This difference 

 in the manner of observing, rendered it 

 necessary to make some alteration in 

 Mr Michell's apparatus ; and as there 

 were some parts of it which I thought 

 not so convenient as could be wished, 

 I chose to make the greatest part of it 

 afresh." 



The " Cavendish experiment r has 

 become famous in the annals of physical 

 science. One of the most appreciative 

 accounts of it and of Michell's share in 

 preparing for it was penned by the dis- 

 tinguished Professor of Natural Philo- 

 sophy in the University of Edinburgh, 

 James David Forbes, more than half a 

 century after both Michelland Cavendish 

 had been laid in the grave. The con- 

 cluding sentences of his narrative may be 

 quoted here : " Cavendish conducted the 

 experiment with his usual patience, judg- 

 ment and success ; he found the joint 

 attraction of the small balls and large 

 spheres to be about ^ of a grain, their 



89 



