223 



This would lead not to a rejection but to a modification of the 

 view put forward by Prof. Marshall that the olfactory organ is a mo- 

 dified gill-cleft. It would then have to be regarded rather as 

 the modified sense organ of a gill-cleft — and in fact as 

 the most anterior of the segmental sense organs. 



For the present, I leave the matter here. 



Another of the many conclusions to be drawn from ray researches 

 is one as to the number of segments contained in the vertebrate head. 

 Marshall' and van Wijhe^have each recognised five segments in 

 front of the vagus. But they differ in that Marshall's first segment 

 is the olfactory, and he does not consider the auditory nerve as a sepa- 

 rate segmental nerve, while van Wij he's first segment is the one 

 containing the ciliary ganglion, he rejects the olfactory segment, and 

 recognises a segment in the auditory region, represented by the audi- 

 tory nerve. My own results drawn from a study of the segmental sense 

 organs would lead to the conclusion that there are six segments in 

 front of the vagus, represented by the following nerves, olfactory, 

 motoroculi (ciliary ganglion), fifth, seventh, eighth, and ninth. Further, 

 since the vagus is known to represent at least four roots, counting 

 these there would be at least ten segments in the vertebrate head, each 

 possessing a segmental sense organ. 



With this, I conclude for the present, leaving all other inferences 

 for the complete paper. 



Manchester, 2Ûth February 1885. 



III. Mittheilungen aus Museen, Instituten etc. 



1. Toluol statt Chloroform bei Paraffineinbettung. 



Von Prof. Dr. M. Holl in Innsbruck. 



eingeg. 16. Januar 1885. 

 Die Behandlung der Objecte (sobald sie nur etwas größer sind und 

 etwas dichteres Gefüge haben) mit Chloroform, um sie für die Paraffin- 

 einbettung tauglich zu machen, hat sehr leicht ein Mißlingen im Ge- 

 folge, ja für manche Objecte (mit sehr dichter und derber Textur) 

 kommt man mit Chloroform nie zum Ziele. Die ganze Procedur 

 dauert ziemlich lange und man hat bei Objecten, welche im Chloro- 

 form nicht untersinken sondern schwimmen (bei den meisten ist 



Op. cit. 

 Op. cit. 



