100 Proceedings of Learned Societies. 
intercommunication between them possible, A — ” embraces 
our atoms; within our atmosphere exists a second, ner, atmo- 
phere, in whieh wg atoms of oxygen and nitrogen bang lke a 
queous vapor was defined to be an invisible gas. Vapor was per- 
mitted to issue horizontally ae erp ure force from a tube connected 
with a small boiler. The of the of condensed steam was 
vividly illuminated by the oe light. “What was seen, however, Was 
not vapor, but vapor condensed to water. Beyond the visible end of the 
jet the cloud resolved itself into true vapor. A lamp was placed under — 
the jet at various points; the cloud was cut sharply off at that point, and 
when the flame was placed near the efflux orifice the cloud entirely | dis 
is same vapo 
vessel containing a freezing mixture, from which it was scraped in quat- — 
tities sufficient to form a small s nawball, The beam of the electric Tamp, : 
moreover, was sent through a large receiver placed on an air-pump. 
single stroke of the pump caused the recipitation of the aqueous vapor 
within, which became beautifully illuminated by the beam; while, upon 
a screen behind, a richly-colored halo, due to diffraction by the lit tle cloud 
within the receiver, flashed forth. 
e waves of heat t speed ist G3 Bey earth a ab our snag 
i) 
ig 
fe) 
ot 
2} 
=r 
oOo 
> 
5 
ej 
8 
eo 
Bo 
&, 3 
SB 
ys 
s 
2 @ a 
ces a : 
Sak e 
a] 
= 
is) 
3 
a. 
e+ 
2 § 
as these are, we might saneraie think ste of them 
as sta to nas wave e ht i meee t 
spaces between the vapor molecules would be an open door for the 
sage of the undulations; and that if those waves were igs all int 
it would be by the substances which form 994 per cent of ree: 
speaker that this small modicum of aqueous vapor intercepted fifteet 
with was not perfectly pure, and that the purer the air became the mor 
it approached the character of a vacuum, and the ey by comp 
the action of the aqueous vapor. The vapor w 0 
with 80, 40, 50, 60, 70 times the energy of the air in oki it 
sed; and no doubt was entertained that the aqueous vapor of 
