FEBRUAHr. 27 
a favourable scene for the occupation of drawing. I have, 
however^ copied a few crystals^ which attracted my observa- 
tion^ and which I will show you. Captain Scoresby^ in his 
CRYSTALS OF SNOW. 
very interesting work on the whale fishery^ has^ if I recollect 
right, a considerable number represented : but it is many 
years since I saw that work, and I have no opportunity of 
referring to it. 
C. — I am surprised that I never observed them before. 
F, — Several circumstances must combine to produce a 
favourable occasion for viewing them : if there is any current 
of mild air^ through which they pass^ they become soft and 
