20G ON SUrERHEATED STEAM. 



rubber is so capable of), and which are so easily 

 practised and are so dangerous in their ultimate 

 results, I must impress upon dentists, for their own 

 benefit, the necessity of procuring the best and 

 purest rubber compound ; and no surer way of 

 doing so can be, than by purchasing it of a house 

 of such high standing as Messrs. Macintosh and 

 Co., and who are not only the first manufacturers 

 in the world in position, but were the first to 

 commence the manufacture of india-rubber in 

 this or any other country. I can speak, further, 

 personally of their scientific and advanced know- 

 ledge on all subjects connected with their business. 

 The patent of Charles Groodyear, dated 1855, but 

 which has lapsed, is one which deserves un- 

 questioned credit, as it, there is no doubt, has 

 paved the way for all that is now done by dentists; 

 for the present details and manner of working up 

 the rubber into bases of teeth is identically the 

 same as he describes, and no other. 



Others have done as much, there is no doubt ; 

 but not, if I may so describe it, in first principles, 

 as Thomas Hancock in a general view, and as 

 C. Goodyear, jun., in his special view for teeth. 



