104 BOTANICAL GAZETTE [FEBRUARY 
we get 8.55 calories per minute for a kilo of peas. But one sees at 
once that in BONNIER’s experiments only short intervals of time 
were employed (36 minutes for the above quoted experiment), 
whereas my experiments lasted for nearly or quite one week. In 
fact, I made no effort to ‘‘ break the record,’ and was not aware of 
the record until I figured my results in order to compare them with 
BonnieEr’s. I venture to think, however, that my experiments 
supplement those of BONNIER by showing the continued liberation 
and loss of great quantities of heat by germinating peas, and pre- 
sumably by other plants or their parts, for a time and not merely 
minute by minute. I need hardly say that the experiment above 
described in detail is only one of many, the results of which are so 
similar that it is unnecessary to report them. 
The quantity of heat liberated by certain animals 
Having some curiosity about the liberation and loss of heat by 
animals, as compared with plants, I made the following experiments. 
One was with two salamanders lent me by the Department of 
Physiology of this University. I put them in separate drained 
Dewar flasks, and left them for 24 hours in the laboratory. The 
temperature in the flasks fluctuated with the room temperature, 
so nearly in the same way as if no animals had been in the flasks, 
that I did not continue the experiment. I report it with no further 
comment than this, namely, that the salamanders must have 
exhaled some warmth, but it was inappreciable. 
The other experiment was very striking. Into cotton-plugged 
drained Dewar flask 14, which weighed 167.2 gr., I put a very 
lively mouse. The weight at the end of the experiment was 186.5 
gr.; therefore, the mouse weighed 19.3 gr. As no excretion, solid or 
liquid, had taken place during the experiment, whatever loss of 
weight had occurred was due to exhalation and evaporation only. 
The thermometer readings for a half hour, beginning at once after 
putting the mouse in the flask, were as follow, the room tempera- 
ture remaining stationary at 20° C. : 
During this half-hour of time, therefore, this mouse gave off by 
radiation and exhalation an amount of heat sufficient to raise the 
temperature within the apparatus 13.95° C. As previously stated, 
