55 2 Richards . — The Respiration of 
3. That in large bulky tissues there is in the natural condi- 
tion a certain amount of enclosed or absorbed C 0 2 , some of 
which is given off very suddenly during the first two or three 
hours after injury, thereby indicating a seemingly higher 
respiratory activity than in the hours which immediately 
follow. 
4. That, in the plants experimented with, the ratio of the 
absorption of 0 2 and production of C 0 2 does not vary within 
very wide limits before and after injury, though there is 
a distinct, if small, increase in the proportion of C 0 2 given off 
in the latter case. Also, that the amount of 0 2 absorbed is 
always in excess of the amount theoretically required for the 
quantity of evolved C 0 2 . 
Botanisches Institut, Leipzig, 
June , 1896. 
Tables of Experimental Results. 
A. 
Determinations with Pettenkofer-apparatus. Air washed 
with potassic hydrate U-tubes. Hydrogen or oxygen when 
used washed also with potassic permanganate and mercuric 
chloride tubes. Air-current regulated by aspirator and 
gasometer in all experiments being 3-500 or a few cc. over 
per hour. When new experiments were begun, or a change 
made in the gases run through the receiver, the apparatus 
was always run at least a half-hour, and often longer, before 
a determination was made. Temperature of receiver and 
plants therein kept constant within -5 to i° by immersion 
in water. The first two or three determinations, unless it is 
stated otherwise in the description of experiment, were taken 
in the uninjured condition. 
