NATURAL PHILOSOPHY. 193 



permanent carbon process. Mr. Thomson, in consequence, went 

 to Nevvcastle-on-Tyne, saw Mr. Joseph W. Swan, the patentee 

 of the chief carbon process, and made arrangements for a large 

 supply of permanent photographs from the stone negatives. 

 Some of these carbon prints were exhibited at Exeter, and met 

 with much approval. Mr. Thomson says that he and Mr, Swan 

 are now trj'ing experiments upon a new process, which they hope 

 will result in the production of blocks from the coral sections 

 which can be used in the common printing press, to print from in 

 printing ink. — Journal of Franklin Inst., Nov.j 1869. 



17 



