e om . 
84 MARITIME OBSERVATIONS. — 
philofophical refearches when in my power to do fo, he 
may be confidered as the original author of what is now 
prefented for examination. 
It will be proper to fufpend any conclufions till the 
journals have been attentively confidered, butas a guide 
to the object of them, it may not be amifs to ftate fuch 
facts as it is prefumed the experiments have a tendency to 
eftablifh. 
1. The water over banks is much colder than the water 
of the main ocean, and it is more cold in proportion as it’ 
is lefs deep. 
2. The water over fmall banks is lefgs cold than that 
over large ones. ie! 
3. The water over banks that are near the coaft is war- 
mer than that over banks far diftant, but it is colder than 
the adjacent fea. 
4. The water over banks of the coaft, z. e. thofe imme- 
diately conneCted with the land above water, 1s warmer 
than that over thofe which admit deep water between them 
and the coaft; but ftill it is colder than the adjacent fea. 
5. The water within capes and rivers does not follow 
the above rules; itbeing lefs agitated, and more expofed’ 
to the heat of the fun, and to receive the heat from the cir- 
cumjaccnt land, muft be colder or warmer than that in 
foundings without, according to the feafons, and tempe- 
rature of the atmofphere. ! 
6. The paflage, therefore#from deep to fhoal water may 
be difcovered by a regular ule of the thermometer, before 
a navigator can fee the land; but as the temperature is 
relative, no particular degree can be afeertained as a rule, 
and the judgement can only be guided by the difference. 
Thus in Auguft I found the water off Cape Cod to be ie 
by Fahrenheit, and at feait was 69°; in October the wa: 
ter off Cape Cod was 48°, and at fea it was 59°. This 
difference was equally.a guide in both cafes, though the 
heat was different at different feafons. et 
