Abstract
During the period January 1936 to July 1938, the upper parts of Betula populifolia Marsh, were analysed for water, reducing sugars, sucrose, total soluble sugars, ether-soluble material, polysaccharide hydrolysable by taka-diastase, and residual polysaccharides extracted by dilute acid. From 38 to 63% of the taka-diastase hydrolysate from the wood is non-fermentable, presumably pentose. The residual acid extract is from 69 to 100% non-fermentable. Hexosan is low in winter, rises to a maximum just before leaf-opening, decreases sharply during spring growth and accumulates in summer. Ether-soluble material is not stored in winter. Sucrose and to a lesser extent reducing sugars are high in winter. There is a significant correlation between reducing sugars and water content of the twigs. Food reserves of the cortex behave much as do those of wood.
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