374 
Journal of Agricultural Research 
Vol. VIII, No. io 
the first day, gradually decreasing thereafter. At the end of each period 
the iron inlet tube of one of the jars was connected to a soda-lime tube 
and a current of air was drawn through the absorption train for 30 minutes 
to remove the carbon dioxid remaining in the jar. The silage could then 
be removed for analysis. The data from the three experiments are given 
in Table VIII. 
Table VIII.— Evolution of carbon dioxid in silage 
[All data calculated to sample of 100 gm. of silage.] 
Age of silage. 
Evolution of carbon dioxid. a 
Experiment 1 
(Gm. COa). 
Experiment 2 
(Gm. COa). 
Experiment 3 
(Gm. COa). 
Days. 
% . 
0. IIC 
. 148 
. 226 
I. 
0. 288 
( 6 ) 
• 341 
.8 
0. 228 
.404 
.490 
8 - 
. 508 
2. 
7 . 
4. 
. 292 
c. 
6. 
7. 
•315 
o These data are from series 3, p. 37°. 
& Determination lost. 
TOTAL ACIOITX.^ 
— / 
/ 
100- 
The curves plotted 
from these data are 
shown in figure 13. 
All are of the enzymic 
form, and check with 
the observations of 
the writer on all the 
silage he has made, 
viz, that the evolution 
of gas is always great¬ 
est during the first day 
or two, and nearly 
ceases after about four 
days. In most cases 
the rate of evolution 
is evidently kept up 
after the first day or 
two by contributions 
from bacteria and yeasts. In experiment 3 the curve shows a change 
of direction and a distinct rise during the second day, coincident, as 
remarked above, with a similar rise in the alcohol curve in the same 
experiment (cf. series 3). 
<0 
* 
■ 
o 
o 
DAYS 
Fig. 9.—Curves showing the development of acidity in series 4 
