This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ... activities of the leaf. Both the moisture content and the concentration of cell sap evidently have some influence on the amount of freezable water. Effect of watering plants with salt solutions on amount of easily frozen water in the leaves.--A method used to harden vegetable plants was watering with salt solutions. Only one of these experiments will be discussed here. On February 15, seedling cabbage plants were potted in 3-inch clay pots, which were plunged in soil on a raised bench in the greenhouse. One series was potted in river sand, one in greenhouse compost soil and a third in compost plus rotten stable manure. Each series was divided into four plots and after the plants were well established one of each series was watered with: (1) tap water, (2) M/10 NaNO, (3) M/10 KC1, (4) M/10 NaCl. These applications were repeated every few days, when water appeared to be required. After the second application, the rate of growth in the different plots was evidently being affected. All of the salt solutions depressed growth but particularly in the series grown in compost and in the compost and manure mixture. Plants growing in the sand showed some of this stunting effect, but much later than in compost soils. A test made March 30 showed that the plants grown in the compost soils and stunted by the salt applications were much hardier than those receiving tap water and making normal growth. Little effect of the salts upon either the size or hardiness of the plants grown in sand could be observed. Plants grown in the compost soils and watered with NaCl were exposed to-6C. for 45 minutes without injury. Plants in compost soils watered with KC1 and NaN03 were injured somewhat under the same conditions, and those receiving tap water were killed. Plants from all of ...