Mr. Faraday on the existence of a limit to vaporization. 493 
upon the subject, and especially relative to such bodies as 
acquire their fixed point at, or somewhat below common 
temperatures. Captain Franklin has kindly undertaken to 
make certain experiments for me in the cold regions to which 
he has gone, and probably when he returns from his arduous 
undertaking, he may have some contributions towards this 
subject. 
Royal Institution, 
May 4, 1826. 
3 S 
MDCCCXXVI. 
