Botany and Zoology. 411 
fathoms; the temperature in the warm area at the depth of 200 
fathoms being 47°, whilst in the cold it was 45°7°. It is below 
this depth that the marked difference shows itself. For whilst in 
e warm area there is a slow and pretty uniform descent in the 
a next 400 fathoms, amounting to less than fowr degrees in the whole, 
4 there is in the cold area a descent of fifteen degrees in the next 
bringing down the temperature at 300 fathoms to 
- 
to its so 2 e sand covering the A iel 
of voleanic minerals, probably brought down from Jan Mayen or 
Spitzberg (3) The fauna of the cold area has a decidedly Bo- 
vi 
n. . 
Although the temperatures —— a 
afford the same striki i he derivation of it 
afford the same striking evidence oe 
ter at 400 fathoms in lat. 594° was only 2°4° colder than water at 
“ws 
