Hydrogen in plants, 66.

Hypocotyl, 78.


Ice, work of, in making soils, 35.

Insects, chewing, 117.
how to combat, 116, 117.
injure leaves, 116.
sucking, 116.

Insect pollination, 131.

Inter-tillage, 164.

Iodine, test for starch, 64.

Iron in plants, 66.


Jointer of plow, 95.
value as a pulverizer, 95.


Kainite, 199.

Knowledge of flowers, value of, 134.