VI CONTENTS 



Some observations on the role of diapause in the pheno- 

 logy of insects in semi-arid zones 

 by J. Harpaz 154 



Cryptobiotic stages in plants: 



Ecological problems of seed dormancy 



by D. KoLLER 159 



Role of plant hormones in dormancy of seeds 

 by Alexandra Poljakoff-Mayber 165 



Dormancy and dormancy-breaking in seeds 

 by S. Klein 175 



Biochemical changes in breaking and inducing dor- 

 mancy in seeds 

 by A. M. Mayer 191 



Rest in buds of woody plants 

 by R. M. Samish 202 



Round table discussion: 



Common aspects of cryptobiosis in different biological 

 systems 

 Moderator: S. Hestrin 210 



Subject Index 227 



