a Resistance and adaptation of the early embryo. Testudo graeca, T. horsfieldi, Emys orbicularis 



and others (Chelonia), Gallus gallus, Anas domesticus, Coturnix coturnix and others (Aves) 

 ZUST, Ms. B.; Ph.D. - Inst, de Zool., Univ. de Fribourg, Perolles, 1700 FRIBOURG, Switzerland 

 a Development of bristles and bract induction. Drosophila melanogaster (Diptera) 

 b Maintenance of determined state of imaginal discs after culture in vitro and transplantation in 

 vivo. Same species as a 



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