. THE PHENOMENA OF HUMAN KESPHiATION. 
19 
ment) the curve for CO 3 exhibits a slight rise during the first hour after food, then a 
slight fall and again a slight rise, the maximum being between 1 and 2 hours after 
food ; but the CO 3 remains high till between 3 and 4 hours after food, while by that 
time the curve was falling rapidly in colder weather. After a j^eriod, from 3 to 4 
hours after food, the curve falls at somewhat the same speed as it does in colder 
weather. In this same chart the curves for the volumes of air and COo expired in 
comparatively w^arm weather (see the dotted line) coincide very closely with each 
other from the time food is taken, till from 3 to 4 hours later; then, while the curve 
for CO 3 continues its regular fall, that for volumes of air expired diverges, crossing 
the line for GO 3 . The effect on the curve for relations is to make it shoot up all but 
precisely to the same extent as in the corresponding curve for warmer weather. This 
circumstance certainly shows that the phenomenon is not accidental, but is actually 
the rule, at all events in the present case. A similar change of coincidence in the 
curves for COg and volumes of air expired is observed in the other person who 
submitted to experiment.— October 23, 1889.] 
WiLLiAM Alderwood Under experiment.—Table shov/ing (1st) Weight of Carbonic 
Acid expired per minute ; ( 2 nd) Volume of Air expired per minute reduced to 
0° and 760 mm. ; (3rd) Relation of Volume of Air expired (reduced) to Weight 
of COo. Temperature of the Lahoratory Air at the time of experiment from 
14° to l7°-3 a 
Weight of Carbonic Acid expired per minute in every hour up to six hours 
after a meal. 
Hours after a 
meal. 
0 to 1. 
1 to 2. 
2 to 3. 
3 to 4. 
4 to 5. 
5 to 6. 
0-460 
0-485 
0-512 
0-461 
0 -444 
0-397 
0-431 
0-435 
0-484 
0-445 
0-400 
0-376 
0-483 
0-410 
0-414 
0-4-29 
0-405 
0-395 
0-402 
O'obo 
0-471 
0-423 
0-392 
0-482 
0-505 
Means 0-458 
0-443 
0-4GG 
0-432 
0-405 
0-386 
