tify of carbonic acid, nor to have lost any part of its 
oxygen gas. Precisely the same results were obtain- 
ed in two other trials, 
666. To obviate any objection arising from the 
circumstance of the hand having been passed into the 
vessel through water, Dr Gordon next immersed his 
elbow to the depth of about four inches in a trough 
of water at temperature 65* ; so that the hand, and 
almost the whole of the fore-arm, remained quite dry 
above the surface. Over the hand and arm, a jar ? 
filled with atmospheric air, was then cautiously in- 
verted. When the mouth of the jar was brought 
into contact with the water, a portion of the air was 
removed by an exhausting syringe, and its place sup- 
plied by the water in the trough, so as to remove 
all danger of the escape of any part of the air actual- 
ly employed in the experiment. During the experi- 
ment, warm cloths were kept constantly applied to 
the outside of the jar. The pulse beat 64 times in a 
minute, and the temperature under the tongue was 
9O. A fine dew soon began to form on the sides of 
the vessel, and to trickle down in small streams. At 
the end of an hour, the hand was withdrawn ; its 
surface felt warm and moist. When the included air 
had returned to the temperature of 60, it was found 
to occupy the same bulk as at first ; and, on being 
submitted to analysis, it yielded no carbonic acid, 
but afforded the same proportions of oxygen and ni- 
trogen gases, as it possessed before the experiment. 
These results, therefore, accord with those obtained 
by Priestley and Klapp ; and seem to prove not only 
