CELL SIZE, NUCLEAR SIZE AND THE NUCLEO-CYTO- 



PLASMIC RELATION DURING THE LIFE OF A 



PEDIGREED RACE OF OXYTRICHA FALLAX 



LORANDE LOSS WOODRUFF 

 Sheffield Biological Laboratory, Yale University 



ONE FIGURE 



CONTENTS 



I . Introduction 1 



II. Materials ., 7 



III. Methods 8 



IV. Cell size and nuclear size 13 



V. Nucleo-cytoplasmic relation ; IG 



VI. Conclusions •. 19 



VII. Summary .,-••• J-t 21 



Literature cited 1 . \ 22 



I. INTRODUCTION 



The fundamental importance of the primary differentiation of 

 protoplasm into cytoplasm and nucleus has naturally led to 

 numerous studies, both morphological and physiological, on the 

 interrelations of these parts of the cell complex. One trend of 

 investigation has been to determine the absolute and relative 

 size of nucleus and cytoplasm in different types of cells, and in 

 similar cells under varying physiological conditions. Among the 

 studies from this standpoint the following may be mentioned as 

 pertinent to the problem in hand. Strasburger ('93) deter- 

 mined, by a series of careful measurements in embryonic stages 

 of over forty species of plants, that there i« quite a definite ratio 

 between cell and nuclear size, and advanced the view that this 

 is determined by the extent of the 'working sphere of the nucleus.' 

 Ger*assimoff ('02) concluded that cell size is determined by nu- 

 clear size, on the basis of the fact that when the daughter nuclei, 



1 



THE JOURNAL OF EXPERIMENTAL ZOOLOGY, VOL. 1.'), NO. 1 

 JULY, 1913 



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