Meteorological Obfervations. 639 
heat of the fummer, therefore, and the cold 
of the winter have a very powerful effe& to 
alter the natural temperature of the fea. 
To afcertain thefe variations an experiment 
was made, about the middle of each month, 
at high water, and during the time of fpring 
tides. ‘The experiment was made with Fahren- 
heit’s Thermometer, and where the river enters 
the new dry dock. 
The firft column of the following table con- 
tains the temperature of the fea; the fecond the 
temperature of the open air in the fhade at 
eight o'clock in the morning of the fame day 
during the year 1772; and the third column 
the temperature of the external air. at two in 
the afternoon. 
Temperature] Air at Air at 
7 72 of the fea. | 8 A.M. 2P.M. 
January 36 
February 36 
March > Bo 38 43 
April 47 48 | 49 
May 55 53 | 58 
June 64 62 65 
July 68 65 69 
Augutft 65 63 67 
September 60 57 61 
October 55 re 58 
November 
December 
From 
