Bemerkungen zur Zellenlehre. 



Von 



Prof. C. Frommaiiu. 



In meinen Untersuchungeu iiber „Struktur, Lebeuserscheiimngeii 

 und Reaktiouen tierischer uud pflanzlicher Zellen" habe ich die 

 Behauptung Heitzmann's zuriickgewiesen, daB er der erste ge- 

 weseu sei, welcher die Netzstruktur des Protoplasmas und die 

 Beziehuugeu der Netze zu den Intercellularsubstanzen nachge- 

 wiesen habe. Heitzmann hat mir brieflich versichert, daB er 

 meine Untersuchuugen ^) iiberhaupt nicht gekannt und demnach 

 auch nicht absichtlich iguoriert habe, und sagt in einem vor der 

 medicolegal society von New York vom 20. Mai 1885 gelesenen 

 Artikel : 



,,C. Feommann of Jena, Germany, in 1867, was the first to draw 

 attention to the fact that the ganglionic corpuscules (ganglion cells) 

 of the spinal cord, with high powers of the microscope, exhibit 

 a reticular structure. He described the nucleus as traversed by a 

 reticular network, whose points of intersection are the granules, 

 hitherto known as nucleoli; furthermore, a delicate reticulum per- 

 vading the mass around the mucleus, and in direct union with the 

 latter, the points of intersection being the so called granules of the 

 protoplasm. The same structure was found by Feommann in a num- 

 ber of other protoplasmatic formations (cells), belonging to the con- 

 nective tissue and the epithelia. He gave no interpretation of the 

 significance of this reticulum and came to the conclusion, that pos- 

 sibly the same structure may by of universal occurrence in bodies 

 known to be protoplasm, i. c. the substance endowed with properties 

 of life. The only illustrations this observer gave with high powers 

 were, however, connective corpuscules from the white substance of 

 the nerve-centres, known by the name of „glia cells", in with he 

 depicted one or several threads emanating from the nucleus and simply 

 traversing the surrounding protoplasm, wich latter he dotted with 



1) Untersuchungeu iiber die normale und pathologische Anatomic 

 des Riickenmarks, II. Th. Jena 1867. 



