120 THE CELL DOCTRINE. 



substance, " Paraplasma," and of a granular fibrillar 

 contractile " Protoplasma," imbedded in the former. 

 The relation and distribution of the protoplasmic 

 fibrillar substance varies in cells of different kinds. 



Strasj^burger * in 1876, observed that in developing 

 cells of Pliaseolus multiflorus^ a network of fibrils is 

 present radiating from the nucleolus, and permeating 

 the interior of the nucleus in connection with a simi- 

 lar network of the cell substance. 



In 1876, Butschlif observed in the nuclei of colored 

 blood-corpuscles of the frog and newt, minute fibres 

 with granular thickenings, but no nucleolus as as- 

 serted by Ranvier. 



Moyzel,:^ in 1875, found in the epithelium of the 

 cornea of the frog, rabbit, and cat, during regenera- 

 tion, large round nuclei, in which he observed filamen- 

 tous masses, either convoluted or radiating from a 

 central point. He regarded these forms as due to a 

 particular stage of division, as described by Biitschli 

 and Strasfeburger. 



0. Hertwig,§ in 1876, also distinguished a " nuclear 

 substance," from a " nuclear juice," and Biitschli,|| in 

 the same year, a " nuclear matter " from a " nuclear 

 fluid." The "nuclear matter" of the latter com- 



* TJeber Zellbildung und ZelUheilung, Jena, 1875. Abstract in 

 Quart. Jour. Mie. Sci., vol. xvi, 1876, p. 138. 



t Studien iiber die ersten Entwickolungserscheinungen der 

 Eizelle, Abhandl. d. Senljenbergisohen Naturf. Gesellsch., Bd. x, 

 1876. 



% TJeber eigenthumliolie Vorgange bei der Theilung der Kerne 

 in Epithelialzellen, Centralbl. f. Medic. Wissensch., No. 50, 1875. 



J Beitrage zu einer einheitliohen Auffassung dor versehiedenen 

 Kornformen, Morphol. Jahrbuoh, 1876, Bd. 2, H. 1, 1876, p. 73. 



II Loc. citat., vol. x. 



