CURRENT LITERATURE. 323
more cellulose. No root-hairs were developed on the wind exposed seedlings while plenty of root-hairs were formed on the control seedlings kept in still atmosphere.
The author thinks that the retardation of growth in the seedlings is not due to the shaking produced by the motor, because seeds sheltered from wind but submitted to the shaking grew quite as well as the control seeds. He thinks "that the stunting effect produced by the wind is not only due to a less favorable wetting, but to greater cooling. The growing point may be robbed by wind of heat which is produced in the cellular growth processes — heat which facilitates growth."
M.O.P.
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