Pure Hydrogen and Nitrogen by Photo- Electrons

The fact that our northern trees and shrubs after they become dormant in the fall require a period of chilling before warm weather will start them into growth again, is a protective adaptation of the highest importance to these plants, for if warmth alVne would start them into growth they would begin growing in Indian summer and the stored food that the plant requires for its normal vigorous growth in the following spring would be wasted in a burst of new autumn growth, which would be killed by the first heavy freezes, and would be followed by a winter of weakness and probable death. Further investigations on the effects of chilling are urged upon those engaged in experimentation bearing on the improvement of horticultural and agricultural practices. It is desirable especially to determine the proper temperatures for the storage of different kinds of seeds, bulbs, cuttings, and grafting wood; proper temperatures for the treatment of plants which are to be forced from dormancy to growth at unusual seasons; and proper temperatures for the storage of nursery stock, so that the nurseryman may havre plants in proper condition for shipment on any date he desires.