1'>C) William A. Kcpner. 



Korschelt, '91, indicated a difference between the nuclei of 

 gland cells that were actually secreting and those that were at rest. 

 lie says: "Nach seiner Darstellung enthaltcn die Kerne secret- 

 gefiillter Driisenzellen zienilich grobe Chromatinkorner, welche dnrch 

 Faden unter einander verbunden sind. Es ist ein derbes Chromatin- 

 netz vorhanden, Avie Hermann es bezeichnet. Mit der Entleeiiing 

 des Secrets findet eine Aendernng der Structurverhaltnisse des Kernes 

 insofern statt, als die derlien Chromatinbrocken aufgelost werden 

 nnd an ihrer Stelle ein feines zierliches C^iromatinnetz tritt, das 

 je nach dem Stadium der Secretausstossung noch eine geringe Menge 

 verkleinerter Chromatinbrocken beherberge, bis dieselben in der 

 volkommen secretleeren Zelle ganzlich verschwninden sind, Diese 

 Beobachtungen lassen auf die anschaulichste Weise eine Beziehung 

 der Kerne zu der Thiitigkeit der Zelle erkennen." Woltereck, '98, 

 De Bruyne, '99, Habes, '00, Gross, '01, and others have followed 

 Korschelt in this interpretation. Gross says: ^'Korschelt (1891) hat 

 entschieden Recht, wenn er diese Erscheinimgen als Anzeichen ciner 

 starken Betheiligung des Kernes an der secret ionschen Thatigkeit 

 der Zelle betrachtet." 



In tliis connection, therefore, it is of interest to note that the 

 nuclei of those nurse cells not attached to the ovum by means of 

 yolk ducts have their chromatin ccmcentrated (Figs. 3, 4, 5). The 

 nurse cells in the distal region of the terminal chamber which have 

 yolk ducts have their chromatin distributed upon a more or less 

 definite, open, reticular net-work (Fig. 2). As the ovum passes down 

 the terminal chamber carrying with it the nurse cells the chromatin 

 in the attached nurse cells becomes finely granular and evenly dis- 

 tributed throughout the nuclear cavity (Figs. 3, 4). In this way 

 the chromatin of these nurse cells behaves in a manner character- 

 istic of numy secreting gland cells. 



During this phase of nutrition vacuoles a])pear within the cyto- 

 plasm of the ovum together with deeply staining granules. These 

 are held to be nutrition products. 



The first phase of nutrition ends with the breaking of the last 

 yolk d\u;ts and the formation of the complete egg and nurse follicles. 



The nurse cells of the completed follicles, except for an occasional 



I 



