Again, by an experiment of the late Mr. Hauksbee s 
in hit Thy)'. Meehan . exp. pag. 170. the denfity of 
the air varies one eighth part between the greateft 
decree of Heat in Summer, and that of Cold in the 
Winter Scafpn. So that the Air, in a hard froft 
when the Mercury hands at 3 1 inches, is near a 
fifth part fpecifically heavier, than it is in a hot day 
when the Mercury hands at 28 inches. 
From Monfl Homberg and John Cafpar 
Eifenfchmid, of the proportion of the fpecific 
weights of certain fluids in the Winter to the 
TAB. XI. 
weights of the fame in the Summer Seafon. 
Mercurius 
Aqua pluvialis 
Aqua huviatilis . 
Aqua dihillata 
Spirit. Vitriol. 
Lac bubulum 
Aqua marina 
Spir. Salis 
Acetum 
Ol. Vitrioli 
Ol. Terebynth. 
Aqua fortis 
Ol. Tartari 
Spir. Vini 
Spir. Nitri 
1.00479 
1.00809 
1. 0081 1 
1. 0081 5 
1.01272 
1. 013 16 
1.01371 
1.01467 
1. 01600 
1.02131 
1.02141 
1.02637 
1.03013 
1.03 127 
1,04386 
The 
