A Di/courfe concernirig- Weather^ isfc. By the karn-^ 
ed Dr Garden of Aberdene. Written by rraj of 
Letter^ to Mr. Henry Scougall , Proieflbr of 
I Theology in that Univcrfity ; and communicated to 
- the Phil. Soc, of Oxford, by the reverend Dr Mid- 
: : dleton,Provbft(/ the Kings College in Aberdeen, 
Sir\ 
I Am forrie, I can give you no better fatisfadion in 
this account you demand of the Conjecture we had 
lately oGcafion to talk about, my other neceffarie di« 
verfions and the few obfervations I have made, render it 
the more imperfect. However fince 'tis your pleafure, 
you fhall haveit as it is; arid if it come afterwards to be 
cleared & confirmed by the joynt obfervations and fen- 
timents of others, it may pais for an Aero-Statical Hy- 
pothefis of the various changes of the Weather. 
We have been hitherto to feek for an intelligible ac- 
count of the afcent of Vapours, the ballancing of the 
Clouds and their dropping dov^n again into rain ; and 
the wind bloweth where it lifteth, and we^ know not 
whence it cometh,nor whither it goeth ; and 'tis like our 
conjectures about the more immediate caufes of all thefe 
may be ftill uncertain GueflTes, yet the works of God are 
fought out of all thole that take pleafure inthemf: and 
the late known properties of the Air, v'^s^. its weight and 
Spring have made men more inquifitive in this matter 
then formerly : and you know how by the obfervations 
of the Barofcope they perceive that theAtmofpheres Gra- 
vity is not always the fame, and are furpriz d to fee the 
Mercury fubfide for the moft part in Foggy, rainy, win- 
dy, or cloudy, weather i and on the contrary to afcend 
and be higheft in calm and clear feafons. I fhall not 
ftayhereto tell you the Conjectures of others about this, 
but ihall only take occafion to coniider how this may 
B b lerve 
