PLATE II. 
THE DEPTHS OF THE OCEAN. ' 207 
PLATE III. 
BROOKE'S DEEP-SEA SOUNDING APPARATUS. 
southward of the Grand Banks of Newfoundland. No satisfactory- 
deep-sea soundings, either in the Pacific or Indian Oceans, have 
as yet been made by those who are co-operating in this admirable 
plan of research.* A few have been made in the South Atlantic, 
but not enough to justify deduction as to its depths or the shape 
of its floor. 
* Since the above was written, I have received a letter from Captain Ringgold, 
commanding the Surveying Expedition in the Pacific, informing me that, on his way 
out, he had obtained, in the southern hemisphere, a deep-sea sounding, with bottom 
at the depth of eight thousand fathoms. The notes and details of this cast have not 
yet been received. 
