884 



otherwise beautiful preparations in the possession of Dr. van Wijhe. 

 These sections were stained with alum- carmine, while mine were treated 

 with borax-carmine or picroborax-carmine. Further the research is in 

 all types an exceedingly delicate one and requires the use of higher ob- 

 jectives (such as Zeiss F), than have usually been employed by other 

 observers. Dr. Kastschenko in a recent paper concludes that his re- 

 sults „über die erste Bildung der Ganglienleiste" approach those of 

 Balp^oue: „und stehen der BEAEo'schen Theorie der Ableitung des 

 Gangliensystems unmittelbar vom oberen Keimblatt, unabhängig vom 

 Medullarohr und Ganglienleiste — entschieden gegenüber". 



Thus Dr. Kastschenko, in spite of the „reichen Material" and 

 the length of time at his disposal, has not been more fortunate than 

 Prof. Rabl. Whatever claims my former researches had to rank only 

 as theory, that name cannot be applied to the results now in the press, 

 for I have shown there that the cranial ganglia arise 

 from two distinct sources quite in dependently of the 

 central nervous system. 



For conveniences of description, and because these two sources 

 appear to be morphologically distinct, I call that portion of the gan- 

 glion which arises from the socalled ganglion Anlage neural gan- 

 glion, while to that portion which is developed in connection with 

 the lateral or branchial sense organs I give the name of lateral gan- 

 glion. Thus each typical cranial ganglion is made up of two parts, a 

 neural part and a lateral part, — whether these two portions were 

 once united in their development or not is another question, which I 

 shall elsewhere discuss when considering Dr. Eisig 's position regarding 

 the homology of the lateral sense organs of Vertebrates with the sense 

 organs of the Capitellidae. It can be proved embryologically 

 that of the following cranial ganglia each and every 

 one is made up of two parts, aneural part and a lateral 

 part which are developed respectively from the sources 

 mentioned above. Olfactory ganglion, mesocephalic, 

 trigeminus, facial, auditory, glossophary ngeus, and 

 vagus complex. Profs. Gegenbaue and His will please note that 

 in the development from two sources the olfactory and auditory gan- 

 glia agree completely with for instance the glossopharyngeal 

 ganglion. 



(Fortsetzung folgt.) 



Frommaniisclte Buchdruckerei (Hermaua Pohle) in Jena, 



