250 Dr. Garneti’s Arrangement 
furface of the earth, &c. which act here, as on other 
occafions, like a bond of union among the other 
diffimilar parts, fo that the air becomes not only 
more homogeneous, concentrated and heavier, but 
alfo may be fuppofed more elaftic and repellent, 
and therefore will communicate a much greater 
preffure to the barometer. 
26th. ‘That when there is not a fufficient quan- 
tity of the principle of beat in the air, to form the 
vapour, &c. into a real mixt (which. is chiefly the 
cafe in winter) the watery vapour enters in a ftate 
of folution into the air, if it continues fufpended, 
and by diffolving in it, a greater cold is always 
produced, (See Remark 11th.) 
27th. ‘That. when the watery vapour that has 
been in folution, feparates itfelf from the air again, 
and floats about in the form of clouds, then the 
heat that was neceffarily taken up in the folution 
of the vapour is fet free, and gives a change of 
fome more warmth to the temperature of the air., 
(See Remark 12th.) 
o8th, That a high barometer may in like 
manner be faid to indicate heat, and a low one 
cold, from the prefence or want of a certain por- 
tion of heat or electrical fire in the air, which 
when in a large proportion muft increafe the warmth, 
folidity, and {pring of the air, efpecially when by 
its prefence a real mixture takes place. But when 
there is a deficiency of the principle of heat in the ' 
atmofphere, the watery vapour cannot be thoroughly 
combined, 
