CONTENTS 



List of participants -/^^GIGXt^N: ^^^ 



Preface by the Editorial Committee • Aj^^^^^S^^'^^^s xi 



Opening address: / uj (^ — — M ^ . 



Cryptobiotic stages m biology . . V-sV •■ ■ ■ ■ •/•^i 

 by H. O. Halvorson ! -^V ■^- • • J ^ I 1 



Cryptobiotic stages in bacteria: ^ ^ >^ 



Anhydrobiosis — a model of a cryptobiotic stage 



by A. KoHN AND M. Lion 15 



The bacterial endospore: A brief review of biochemical 



advances and some notes on sporogenesis 



by H. Orin Halvorson 32 



Studies on the germination of spores of B. Ucheniformis 



by A. Keynan and M. Halmann 64 



The biochemical nature of the dormant state in the 



bacterial endospore 



by H. Halvorson, R. O'Connor and E. Doi ... 71 



Cryptobiotic stages in fungi and parasitic worms: 



Hypobiosis in parasitic worms 



by G. WiTENBERG 97 



Hypobiotic phenomena in fungi and their significance 



in plant pathology 



by L Wahl 107 



Cryptobiotic stages in insects: 



Insect diapause in relation to the environment 



by A. D. Lees 120 



The endocrinology and biochemistry of insect diapause 



by A. D. Lees 132 



Environmental factors in interruption of development 



of Acrididae eggs 



by A. S. Shulov and M. P. Pener 144 



806 





