THE PHYSIOLOGY OF DEEP-SEA LIFE. 299 
The specific gravity of the surface water of the American 
coast, as worked up by Mr. Buchanan from the observations of 
the “Challenger” and other vessels, is as follows : — 
In the Atlantic outside of the West India Islands (Fig. 194), 
close to the American coast, on a line about at the end of the 
»Üermuda 
Fig. 194. —Specifie Gravity of Sea-Water. Western N. Atlantic. (Buchanan. 
5 р А 
Bahamas, it varies between 1.0270 and 1.0275. In the Carib- 
bean and Gulf of Mexico, as well as waters parallel to the 
Atlantic coast as far as Cape Hatteras, and after that along the 
course of the hundred-fathom line, it is between 1.0265 and 
1.0270. For the waters within a line drawn from Newfound- 
land to Cape Cod, the specifie gravity is below 1.0260. 
The saltest water was found by the “ Challenger " in the middle 
