Sat Meteorological Obfervations. 
I fhall infert an extract of .a letter which I 
received from -Dr. Renwick, ‘who, at my re- 
queft, had the goodnefs to make inquiries of 
Mr. Hutchinfon. 
** Concerning the velocity’ ae the winds, Mr. 
H. couid not fay he was very exact during two 
or three of the firft years of the Journal, as 
he noted it down from his own judgement; 
he afterwards~tried it bythe method of find- 
ing the fhip’s velocity by heaving the log. He 
faftened a fhip’ s log-line about his waift, while 
fome perfor who underftood the nature of it, 
attended to the log glafs, and line. He made 
ufe of a common walking-ftick, to the end of 
which he affixed a crofs ftick (fimilar to the 
yard of a fhip,) and to the end of the crofs 
ftick he affixed a filk handkerchief. As he 
ran, the handkerchief was carried forwards by 
the wind, and when the handkerchief fell flat 
upon the ftick, he judged that he had run as 
faft as the greateft velocity of the wind. He 
alfo tried a fimilar experiment with a boat, 
which had two fails before the wind in fmooth 
water, in fuch as a ftiff-failing fhip might carry 
her top-gallant fails.” 
In 
