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2. Chawan, D. D.: Ecophysiological observations on arid zone plants with special reference to seed germination and rhizology. Ph. D. thesis, University of Jodhpur (1970).
3. Chawan, D. D. Sen, D. N.: Diversity in germination behaviour and high temperature tolerance of seeds inCorchorus aestuans Linn. Ecology (in press, 1971).
4. Crocker, W.: Mechanism of dormancy in seeds. Amer. J. Bot.3, 99?120 (1916).
5. ? Barton, L. V.: Physiology of seeds. Waltham, Mass: Chronica Botanica Co. 1957.