fSS A Description of a Property of 

 A DESCRIPTION 



of a Property of 



CAOUTCHOUC, 



or Indian Rubber ; 



With some Reflections on the Cause of the Ulasticiiy 

 of this Substance. 



IN A LETTER TO DR. HOLMH. 



Jlead February ii, xSoj. 



Sir, 



Middleshaw, near Kendal, Nov. i5, i3oa. 



X HE substance called Caoutchouc, or In- 

 dian Rubber, possesses a singular property; 

 which, I believe, has never been taken notice 

 of in print, at least by any English writer ; the 

 present letter contains my experiments and 

 reflections on the subject; and should they 

 appear to deserve the attention of your philo- 

 sophical friends,'! am certain you will take the 

 trouble of compiunicating the paper to the 

 Literary and Philosophical Society of Man- 

 chester. 



The property I am about to describe, de* 

 pends on the temperature of the Caoutchouc, 



