122 THE CELL DOCTRINE. 



Structur," was seen by Flemraing in the nucleus of 

 all cellular elements of the bladder of Salamandra, 

 epithelial cells, connective tissue cells, migratory 

 cells, unstriped muscle-cells, nerve-cells, endothelial 

 cells, and blood-corpuscles. With regard to Flem- 

 ming's observations, Klein* says their clearness and 

 extent leave no doubt that the network in the nu- 

 cleus represents a definite and pre-existing structure. 

 This has been to a certain extent questioned by Lang- 

 hansf as regards the fresh cells of the human decidua 

 serotina, but, Klein again observes, "Memming's 

 assertions cannot be in the least shaken, considering 

 that he observed the above structure, not only after 

 the use of reagents, e. g., acetic acid, chromate of 

 potash, alcohol, chromic acid, with or without sub- 

 sequent staining in carmine or hsematoxylin, but also 

 in the absolutely uninjured bladder, i. e., while this 

 organ was being observed in the living curarized 

 animal." And, in a later note, Flemniing:|: states 

 that he observed the same network in the nuclei of 

 various cells, also in the living and perfectly unin- 

 jured larva of Salamandra. 



Eberth§ noticed nuclei containing anastomosing 

 filaments in their interior in the epithelium of the 

 cornea and the endothelium of the membrana Des- 

 cemeti under normal conditions. He regards them 



* Loc. citat. 



\ Zur Lehre von Zusammensetz. des Kerns, Centralblatt f. 

 Medic. Wissenschaft, 1876, N. 50. 



J Zur Kenntniss des Zellkerns, in Centralbl. f. Medic. Wiss., 

 1877, No. 20. 



§ Ueber Kern imd ZelUheilung, Virohow's Archiv, Bd. 67, 

 1876. 



