By Chr. P. Raven and G. Kerkut (Auth.)
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Z y g o t e nucleus pushed to o n e s i d e b y t h e c o n s t r i c t i o n of t h e e g g . ( a ) f i r s t c l e a v a g e i n t h e nucleated half; (b) further c l e a v a g e s in this part, the other half i s s t i l l u n c l e a v e d ; ( c ) p a s s a g e of o n e n u c l e u s f r o m t h e n u c l e a t e d i n t o t h e n o n - n u c l e a t e d half, b e g i n n i n g o f d e v e l o p m e n t i n t h e l a t t e r ; id) t h e t w o e m b r y o s t h a t d e v e l o p e d f r o m t h e c o n s t r i c t e d e g g ; t h e one p r o d u c e d b y t h e half in w h i c h n u c l e a t i o n w a s r e t a r d e d is considerably y o u n g e r , b u t n o r m a l l y built.
9 ) . Dalcq concluded from these experiments that the power of di vision, especially that of forming a bipolar mitosis, is an inherent property of the sperm nucleus, in particular of its nucleoplasm. Yet there is an objection to this conclusion. There are several exceptions to the rule that co-operation of the male pronucleus THE FERTILISATION OF THE EGG 27 F i g . 9. T w o s e c t i o n s of a f r o g ' s e g g , f e r t i l i s e d w i t h t w o t r y p a f l a v i n treated s p e r m s Λ ' : haploid nuclei, originathig from the e g g nucleus; s p e r m c h r o m a t i n h a s r e m a i n e d c o m p a c t ; a: m i t o t i c s p i n d l e s w i t h out chromosomes.
In the abnormal embryos, cellular differentiation was good in some tissues, deficient in others, depending on the region of the donor from which the transplanted nucleus had been taken. Briggs and King conclude from their results that the nuclei lose their equipotentiality and become differentiated during gastrulation. This progressive specialisation of the 42 THE STRUCTURE OF THE FERTILISED EGG nuclei goes hand in hand with cellular differentiation; therefore, it cannot be considered as the cause of the determination of the cells, but must rather be a consequence or attendant phenomenon of cell differentiation (Plate III).