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

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G. in polychaete worms and in molluscs. In the course of this development, the stratification is lost to some extent, and the material of the egg is redistributed more evenly. Finally, normal embryos will b . formed. All these experiments give positive indications that the cyto­ plasm of the fertilised egg cannot contain a complex spatial structure, in which each part represents one definite organ, or part of the body, of the future embryo. For if this were true, the division of such a structure into two halves (as in the experiments with isolated blastomeres) would be bound to cause defects in the embryos developing from each half.

The various observations and theories may perhaps be sum- T H E F E R T I L I S A T I O N O F T H E EGG 29 marised as follows: the formation of a bipolar cleavage spindle in normal fertilisation is due to the activity of the sperm cyto­ centre. The division of a cytocentre is in general somehow dependent on the presence of a nucleus, especially of its nucleo­ plasm. 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.

Here, too, under certain circumstances both halves will develop into harmoniously built embryos of half the normal size, which lie together in one egg capsule (Spemann, 1903), (Plate I ) . Even if newt eggs are divided into two halves at a much older stage, after the completion of cleavage, each half may still develop into a complete, normal embryo. From other eggs, large parts of the egg cytoplasm can be THE STRUCTURE OF THE FERTILISED EGG 33 removed before the beginning of cleavage, without any disturbance of their further development.

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