Reserve Food Materials in Vegetative Tissues

All the species examined showed a high starch content during the summer, which disappeared during October. 2. All the trees and shrubs of this district which were examined contained oils and fats as food reserve during winter with the exception of Lonicera glaucescens and Crataegus sp. The presence of sugar was demonstrated in many of the species. Quantitative determinations in a few places gave a total sugar content of 0.5-2 per cent. 3. Deciduous leaves, at the time of leaf fall, were devoid of starch, but contained oils and fats. 4. Most of the species of alpine Salicaceae and Ericaceae examined showed the presence of both starch and oil during the vegetative season. Gaultheria ovatifolia, a lowland species, showed only oil. Hence the ability to form starch does not seem to be associated with climatic conditions, resulting from high altitudes.