THE SO-CALLED CENTRAL BODIES IN FERTILIZED ECHINARACHNIUS EGGS

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Abstract
When fertilized Echinarachnius eggs were allowed to develop at various temp. and fixed in a sublimate-acetic mixture, asters of the 1st cleavage figure were large and had distinct rays at the upper temp., whereas they were small and had vague rays at lower ones. In both metaphase and anaphase centrosomes (the large, diffuse type of central body) were present only at the upper temp. intervals, at which, rays were distinct and reached the mid area. Simultaneously with the fading of the rays at low temp., the centrosomes disappeared; The result indicates that the centrosome is actually a coagulation product of the focal region of distinctly fixed rays, having no existence as an individualized structure in the living egg. There are no centrioles (the minute, period-like type of central body); they are occasionally simulated by cytoplasmic granules.

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