and deepeft mafs of water we know of; becaufe it is always in 

 motion, and communicates with the water of temperate climates; 

 becaufe Tea- water is not fo eafily frozen as frefh water ; becaufe 

 the ice found in the fea is folid, and in transparency not different 

 from the ice of frefh water; and, laftly, becaufe this floating ice, 

 which is met with by navigators, both in high northern and 

 fouthern latitudes, when melted, is palatable to the tafte; whereas 

 the ice formed from fea-water is very faline, if it be thawed with- 

 out having been warned in frefh water. 



" It is alfo prefnmed, that in the deep Northern feas the 

 water near the furface will be found warmer than that near the 

 bottom at the approach of fummer; and will be found colder 

 near the furface than at the bottom in the firft month of the 

 cold feafon, for the reafons already exprefTed: and in ]ike manner, 

 that, during the firft fix or eight hours of a froft in England, the- 

 water in any deep lake will be found colder near the furface than 

 at the bottom , but that the water at the bottom will be found 

 colder than that near the furface in twenty-four hours after a 

 thaw, provided the air be temperate or nearly fo," 



IT 



