Yolk-nucleus and polar rings

✍ Scribed by Katharine Foot

• Publisher: John Wiley and Sons
• Year: 1896
• Tongue: English
• Weight: 986 KB
• Volume: 12
• Category: Article
• ISSN: 0362-2525
• DOI: 10.1002/jmor.1050120102

✦ Synopsis

POLAR rings have been observed in CZepine by Grube, Leuckart, Robin, and Whitman,' in Rhymhelmis, by Vejdovsky? and in AlZolobophora foetidaa by the author.

In the present paper I hope to prove that the polar rings and the so-called yolk-nucleus are one and the same substance, and that therefore the material which forms these structures is by no means confined to the three forms just mentioned.

In the fall of 1894, I identified the granular masses of cytoplasm found in the ovarian egg with the polar rings of later stages, and traced the substance step by step during the growth of the maturizg and fertilized egg ; but the publication of this work was reserved to form part of a later paper on the maturation and fertilization of the egg of A h -Zoobo$ht-a foetida. 1 C. 0. Whitman, "The Embryology of Clepsine." Quart. fours. of Micr. F. Vejdovsky, '' Entwicklungsgeschichtliche Untersuchungen." Prag, 1892. Preliminary Note on the Maturation and Fertilization of the Egg of AZZ*