90 
MANUAL OP NATURE STUDY, 
which the stalk grew. What has become of the 
food part of the grain ? What is now the condi¬ 
tion of the tap root ? 
Can you tell when the tap root ceases to be of 
use to the plant ? What about its growth after its 
use has ceased ? A few lessons on survival of the 
fittest would be of interest in connection with this 
subject of roots. 
In a box of radish seed sow also some crow-foot 
grass seed, and note the result as to which is mas¬ 
ter of the garden. 
On your way to school some autumn morning 
pull up by the roots some crow-foot grass, timothy, 
Jimson weed, and some other weeds and grasses, 
and let the children discuss the merits of each 
plant as to its ability in the struggle for existence, 
taking into account the adaptability of the roots to 
the maintenance of the plant. 
The Sap. 
As an introduction to this subject, review stems, 
and show clearly what the stem is, as distinguished 
from the other parts of the plant ? How does the 
stem assist the leaves and roots in their work of 
nourishing the plant ? 
Review the purpose, or function of the leaf. 
Also of the roots. 
