Kansas Univehsity Scien 



Vol. II, No. 10. 



FEBRUARY. 1904. 



WiiOLE Series, 

 Vol. XII, No. 10. 



THE VITELLINE BODY IN SPIDER EGGS. 



BY NADINE NOWLIN. 

 With plates XII to XV. 



I. — Introduction. 



II. — Historical Statement. 



III. — Nomenclature. 



IV. — Material and Means of Collecting. 



V. — Technical Methods. 

 a. Fixation. 

 h. Staining. 



VI.— The Ovary. 



VII. — Observations. 



a. Development of the ovary. 

 6. Development of the oocytes. 



c. The vitelline body. 



d. The vitelline zone. 



e. The egg-stalk. 



/. Eggs without the vitelline-body. 



VIII. — Summary and Interpretation. 

 IX. — Bibliography. 

 X. — Plates and Explanation. 



I. INTKODUCTIOIV. 



T^HE object of this work on the spider egg has been to gain 

 some understanding of the peculiar element known as the 

 vitelline body. Only those cell phenomena which in some way 

 concern the origin, destiny and function of the body have been 

 touched upon. 



I want to express my thanks to Dr. C. E. McClung, who 

 directed the work, and also to Mr. M. W. Blackman, for many 

 helpful suggestions. 



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