114 
VEGETABLE l'ORCING 
hours after fumigation is begun, but the more com- 
mon practice is to wait until the next morning. The 
houses may then be entered for a few minutes with 
safety and the ventilators opened as wide as the weather 
Fig. 36.—Male nem- 
atode: J, worm in-pro- 
file view; II, head of 
the same, more highly 
magnified; III, middle 
region of worm show- 
ing blind ends of the 
sexual organs; IV, pos- 
terior extremity. The 
drawings were prepared 
from stained _—_speci- 
mens, examined in car- 
bolic acid solution. 
a, lips; b, cesophageal 
tube; c, median bulb; 
d, excretory pore; e, 
spear; f, intestine; g, 
blind ends of testicles; 
h, testicles; i, specula; 
j, tudimentary bursa; 
k, anus. (After N. A. 
Cobb.) 
will permit. It is better not to stay 
in the houses until the ventilators have 
been opened for at least one-half hour. 
The odor of the gas will be noticeable 
the next morning, but this need cause 
no concern. 
Sulphuric acid should also be handled 
with care. It is destructive to clothing 
and it burns the flesh. Flesh burns 
should immediately be washed with 
water, and oil or vaseline applied. 
Inasmuch as cyanide of potassium is 
a most dangerous poison, it should be 
kept under lock and key, away from 
children. The smallest granule taken 
internally will be almost certain to 
cause death. 
It is a simple matter to determine 
the number of cubic feet in a green- 
house. For instance, suppose the 
house is even span and 30 by 100 feet 
in size, 6 feet from ground to eaves and 
9 feet from eaves to ridge. The cubic 
contents below the eaves would be 30 
by 6 by 100 or 18,000 cubic feet. The 
space above the eaves would be 30 by 
9 by 100 divided by two, or 13,500 cubic 
feet, a total of 31,500 cubic feet for the 
house. To determine the space above 
the eaves in an uneven-span house, 
draw a perpendicular line from the 
ridge to the level of the eaves, thus 
making two triangles. The contents 
