L-3«3 ] 
feem’d fill’d near to an exad Level with the Stratum 
from whence they came. 
But when the Weather became rainy, the Quan- 
tity as well as the Impetus of the Effluvia increafed to 
fuch a Degree, as to appear ill Mornings over the Top 
of the Well, in the Form of a Mift, and gave great 
Annoyance to thofe that came within its Sphere of 
A&ion/ 
From hence it is worth obferving, that the fame 
Damp, according to the Variation of the Weather, is 
fpecifically heavier or lighter than the Air. 
IX. An Extra A from the Journal Books of 
the Royal Society, concerning Magnets 
having more Poles than two-, hy John 
Eames, F. R. S. with fome Obfervations hy 
2)r. Defaguliers on the fame Subject. 
T H E fagacious Dr. Halley , in his Account of 
the Changes of the Variation of the Magne- 
tical Needle, upon the Hypothefis of the Earth’s be- 
ing one great Magnet having four Magnetical Poles, 
tells us, that he had found two Difficulties not eafy 
to furmount ; the one was, that no Magnet he had 
ever feen or heard of, had more than two oppofite 
Poles, whereas the Earth had vifibly four, if not 
more, &>c. I find in looking over the Copy of the 
Journal-Book of this Honourable Society, Vol. II. an 
Article in the following Words : 
