2o 



HISTOLOGY. 



very few investigators, protoplasm lias no definite structure 

 /'.'., it is quite homogeneous. 



The second is the fibril network tln-nry. which considers the 

 protoplasm as made up of a thread-like network and an inter- 

 stitial substance. With regard to these strongly refractive 

 fibrils different views are held. According to some authors 

 Hemming), they do not join with one another in any way ; 

 while according to others they combine to form a sort of net- 



FlG. 1. 



. X II d CHI' 



friiiiH-irork 

 -".Y//c/fW/;.s- 



Protoplasm ic 

 framework 



B* | .1 rchnitlii.ti, 

 ; irith tlif 

 1-cnti-iixinnr 



Nuclear uid 



Tnierflbrillar *nhvtunce 



Diagram of a cell. The lower segment illustrates the fibrillar theory, the upper the 

 granular theory, the left the fuain theory. At the rijrht tlie pnitoplasinic threads radiate 

 from the centrosome. The nuclear network consists of imclein, linin. and lantunin. 



work, so that a sponge-like structure is formed ( I leit/niann, 

 Fromman, Leydig). The less refractive and more fluid inter- 

 stitial substance separates the fibrils from one another. The 

 latter form the so-called filar-maM or mitom. the former the 

 inter filar-mass or paramitom. The fibrils occur in varying 

 (juantities in the cell, are of different lengths, and often are 

 coiled. r rhe interstitial substance often contains more or less 

 numerous granules. 



