1076 Experiments and Papers, QNo. 144. 



cheaper, (first cost,) is not superior to copper in any way. The zinc is 

 not used now ; I suppose from its so soon corroding, and in fact be- 

 coming rotten. 



I shall be glad to afford you any information in my power, and am, 



Yours, &c. 

 (Signed) Andrew Henderson. 

 Dr. O'Shaughnessy, Medical College. 



(True Copy.) 

 (Signed) C. B. Greenlaw, Secretary. 

 Fort William, Marine Superinten- 

 dent's Office, the 2%d Sept. 1843. 



To M. Rustomjee, Esq. 



Dear Sir, — When the " Sylph" was docked after her return 

 from the coast of China last December, we found her copper covered 

 with large barnacles in clusters, although after she came in fresh 

 water a great many had dropped off, but left the mark where they 

 had been. The copper was likewise all in small holes, and rusted 

 at the edges, the same as a piece of iron, a great quantity of which 

 I think was mixed with the copper, which caused the barnacles and 

 sea-weed to adhere, amongst which, when on the coast, were a large 

 quantity of long worms resembling centipedes, but much smaller. 



I remain, &e. 

 May 18, 1841. (Signed) T. Williams. 



(True Copy.) 

 (Signed) C. B. Greenlaw, Secretary. 

 Fort William, Marine Superintendent's 

 Office, the 23rd Sept. 1843. 



H. C. S. Vessel " Phlegethon," Calcutta, May 27, 1841. 

 Sir, — In reply to your letter of the 24th May, I beg to assure you 

 I shall have great pleasure in affording all the information in my 

 power on the effects of the voyage on our Iron Vessel. 





