THE FLOWER 241 
these allurements to attract the visits of insects. Besides 
being wasteful, wind pollination is very uncertain. The 
pollen cannot be blown about very well unless it is dry, and 
in rainy weather it may all be rotted or washed away before 
it can reach the stigmas that are ready to receive it. 
Practical Questions 
1. Why do the flowers of oak, willow, and other wind-fertilized plants 
generally appear before the leaves? (274.) 
2. Can you account for the showers of ‘‘sulphur” sometimes reported 
in the newspapers? (275.) 
3. Do you see any connection between the feathery stigmas of most 
grasses and their mode of pollination? (274.) 
4, Why are house plants not. apt to seed so well as those left in the 
open? (Exp. 80.) 
5. Why are the tassels of corn placed at the tip of the stalk? (274.) 
6. Can you trace any connection between the winds and the corn crop? 
(274.) 
7. If March winds should cease to blow, would vegetation be affected 
in any way? (274.) 
8. Why are wind-fertilized plants generally trees or tall herbs? (274.) 
9. Is it good husbandry to plant different varieties of corn or other 
grain in the same field, if it is desired to keep the strain pure? (255, 274.) 
10. Is water a good pollen carrier? (275.) 
11. What is the only class of plants it is likely to reach? 
12. What is the only other agency, besides wind and water, by which 
this office can be performed ? 
C. Insect PoLLINATION 
Materia. — Half a dozen panes of glass, about 6X9; squares of 
bright-colored cloth or paper; a few spoonfuls of honey or sirup; per- 
fumes of various kinds, preferably flower extracts; fetid and disagreeable 
smelling substances, such as a bit of decaying animal or vegetable matter. 
Observations on living plants can best be made out of doors or in a green- 
house, as opportunity offers. 
EXPERIMENT 81. HAs THE COLOR OF FLOWERS ANY ATTRACTION FOR 
INSECTS ? — Place half a dozen panes of ordinary window glass out of doors 
or in an open window to which insects can have free access. Lay under 
the first pane a piece of black paper or cloth, and under the others bright- 
colored pieces of red, blue, white, yellow, and purple. Drop on the center 
of each pane a little honey or sirup, and watch. Do insects show any 
color preferences? Which color attracts fewest visitors? Which most? 
