r i 4 8 ] 
profequendi Invitationem tuam proficifcuntur, It- 
benter, ut opinor, videbis. Vale. Patavio. Kal. Juru 
eiDIDCCXXXVII. 
III. T*he Imperfections of the common Baro- 
meters, and the Improvement made in 
them > by Mr. Cha. Orme of Afliby-de-la- 
Zouche in Leicefterfliire, where they are 
perfected and rectified 5 with fome Obfer- 
vations , Remarks and Rules for their Ufe > 
by Hen. Beighton, F- R» S. 
A S we know nothing more wanting than a 
Theory of the Weather on Mechanic Prin- 
ciples 3 there does not feem any thing in all Philofophy 
of more immediate Concern to us than the State of 
the Weather. 
In order to which, a complete Hiftory of the Wea- 
ther is necelfary, to deduce from thence fuch Rules 
and Obfervations as may in fome meafure form fuch 
a Theory : And it may be faid, that could we in any 
tolerable degree foretel, but by fome fmall Space of 
Time, the Change of the Weather, it would be of 
admirable Ufe to us, in thofe Affairs on which the 
chief part of our Welfare and Subfiftence depends. 
It was from fuch Confiderations, that more than 
20 Years ago I began, and have continued, to keep a 
'Diary of the Weather (the fix laft Years of which I 
have here fubjoin'd) 3 but cannot think myfelf fo well 
qualified as to form a juft Theory upon them, though 
