C 136 ] 
tor and between the tropics pretty fteadily, one way 
all day long, and dying away at night ; while high 
winds and ftorms, blowing all manner of ways, are 
found in the higher latitudes. I fliall not detain you 
to fliew, that the fun’s rarefying air cannot limply be 
the caufe of all the regular and irregular motions, 
which we find in the atmofphere j but I fhall pro- 
ceed to what, I think, is the caufe, viz. the afcent 
and defcent of vapour and exhalation, attended by 
the eledirical fire, or fluid. 
You are well acquainted with the calculations (by 
fundry authors) of the quantity of vapours raifed in 
a day j but I will venture to fay, that all thofe, which 
I have met with, fall exceedingly Ihort of the quan- 
tity raifed in the torrid zone. Now, all this vapour 
and exhalation, being buoy’d up by the eledrical fire, 
muft add a column to the air (though of a different 
matter) at lead: a thoufand times greater than the 
vapour and exhalation taken up; which column 
muft neceffarily force the adjacent part of the in- 
cumbent air upwards; and muft as neceftarily be 
readied upon by the incumbent air, to reftore the 
asquilibrium of the whole air. And as it cannot be 
readily forced down again, it muft float off, at that 
altitude, toward thofe parts, where little or no addi- 
tion has been made to the atmofphere ; and by that 
means muft propel the air on the horizontal level 
with it, and that below it, as it is itfelf propelled by 
the weight of the incumbent air. And that motion 
muft be from the equator (where the greateft quan- 
tity of vapour, &c. is raifed), toward the poles, and 
partly to the weft ; as the column of vapour is al- 
ways rifing from eaft to weft, as the earth turns to- 
ward 
