An Outline of Developmental Physiology by Chr. P. Raven and G. Kerkut (Auth.)

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By Chr. P. Raven and G. Kerkut (Auth.)

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1) Sometimes, in the act of penetrating, the sperm remains stuck with its head in the cortex. In such cases, normal development of the sperm nucleus does not take place. The egg is activated only, and THE FERTILISATION OF THE EGG 25 a monastral cycle ensues. g. when eggs of the toad Bufo calamita are fertilised with sperm of the newt Triton alpestris (Bataillon). g. by trypaflavin poisoning (Dalcq). (2) If the fusion of the pronuclei is prevented, each may, under certain circumstances, develop separately in such a way that the male pronucleus undergoes a normal mitosis, whereas the female pronucleus gives rise to a monaster.

G. when an "onde de gélifica­ tion" has passed through the cytoplasm. CHAPTER ΠΙ The structure of the fertiHsed egg The structure of the egg at the starting point of its development seems to be quite simple. But, as we have seen in the Intro­ duction, it is conceivable that this simplicity is only apparent. The whole complicated spatial structure of the later organism might already be present, in a not easily recognisable form, in the egg. According to the preformation theory, which had many supporters in the 17th and 18th centuries, the complete young animal was already contained in the fertilised egg, in the same way as a complete stalk with leaves, flowers, etc..

When an "onde de gélifica­ tion" has passed through the cytoplasm. CHAPTER ΠΙ The structure of the fertiHsed egg The structure of the egg at the starting point of its development seems to be quite simple. But, as we have seen in the Intro­ duction, it is conceivable that this simplicity is only apparent. The whole complicated spatial structure of the later organism might already be present, in a not easily recognisable form, in the egg. According to the preformation theory, which had many supporters in the 17th and 18th centuries, the complete young animal was already contained in the fertilised egg, in the same way as a complete stalk with leaves, flowers, etc..

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