36 PRACTICAL COURSE IN BOTANY 
EXPERIMENT 29. WHAT TEMPERATURE IS MOST FAVORABLE TO GERMI- 
NATION ? — Put half a dozen soaked beans on moist cotton or sawdust in 
three wide-mouthed bottles of the same size or in germinators arranged as 
in Figs. 48, 49, the seed also being selected 
with a view to similarity of size and weight. 
Keep one at a freezing temperature; the 
second in a temperature of 15° to 20° C. 
(see Appendix for Fahrenheit equivalents) ; 
and the third, at 30° C. If a place can 
be found near a stove or a register, where 
an even temperature of about 125° F. 
is maintained, place a fourth receptacle 
there. Observe at intervals of twenty- 
four hours for a week or ten days, keeping 
the temperature as even as possible, and 
maintaining an equal quantity of moisture 
in each vessel. Make a daily record of 
your observations. What temperature do 
Fries. 48,49. Home-made ger- 
minators: 48, closed; 49, showing : 2 
interior arrangement. you find most favorable to germination ? 
ExprERIMENT 30. AT WHAT TEMPERATURE DO SEEDS LOSE THEIR VITAL- 
ity? — Place about two dozen each of grains of corn, beans, squash 
seed, and castor beans, with an equal number of plum or cherry stones, 
in water, and heat to a temperature of 150° F. After an exposure of 
ten minutes, take out six of each kind and place in germinators made 
of two plates with moist sand or damp cloth between them, as shown 
in Figs. 48, 49. Raise the temperature to 175° F., and after ten minutes 
take out six more of each kind of seed and place in another germinator. 
Raise the water in the vessel to 200°, take out another batch of seeds; 
raise to the boiling point for ten minutes more, and plant the remain- 
ing six of each lot. Number the four germinators, and observe at in- 
tervals of twenty-four hours for two weeks. The harder kinds should be 
kept under observation for three or four weeks, as they germinate slowly. 
Try the same experiments with the same kinds of seeds at a dry heat, 
using a double boiler to prevent scorching, and record observations as before. 
EXPERIMENT 31. TIME REQUIRED FOR GERMINATION. — Arrange in 
germinators seeds of various kinds, such as corn, wheat, peas, turnip, apple, 
orange, grape, castor bean, etc. ‘‘Clip”’ some of the harder ones and keep 
all the kinds experimented with under similar conditions as to moisture, 
temperature, etc., and record the time required for cach to sprout. What 
is the effect of clipping, and why ? 
EXPERIMENT 32. ARE VERY YOUNG OR IMMATURE SEEDS CAPABLE OF 
GERMINATING ? — Plant some seeds from half-grown tomatoes, and grains 
