INDIA-RUBBER, OR CAOUTCHOUC. 



4.33 



Trees from which Caoutchouc is extracted. 



out, which, on exposure to air, thickens into a sub- 

 stance of a pure white colour, having neither taste 

 nor smell. The hue of the caoutchouc of commerce 

 is black in consequence of the method employed in 

 drying it. The usual manner of performing this 

 operation is to spread a thin coating of the milky juice 

 upon moulds made of clay, and fashioned into a 



