162 STORRS AGRICULTURAL EXPERIMENT STATION 
Here we see the increase of CO2 jn ~Incibacaauees 
from 4.8 to 29.5 pts. In Incubator 18 there is an increase 
from 9.6 to 28 pts. There is a corresponding increase in In- 
cubator 19. This table shows the increase in the amount of 
COz2 to be due to the growth of the chick in the egg. This 
COz2 comes from the network of capilaries which lie just 
under the shell and is produced by the life processes taking 
place within the egg. 
