AUTHORS ABSTRACT OF THIS PAPER ISSUED 

 BY THE BIBLIOGRAPHIC SERVICE, JUNE 21 



ON THE ORIGIN OF THE GANGLION CELLS OF THE 

 NERVUS TERMINALIS OF THE ALBINO RAT 



F. W. STEWART 



Department of Zoology, Cornell University, Ithaca, New York 



FIVE FIGURES (ONE PLATE) 



Realizing the tendency which has existed among morpholo- 

 gists more recently considering the subject of the ganglion cells 

 of the nervus terminalis to regard them as sympathetic in char- 

 acter, the author (Stewart, '20), in a general paper on the devel- 

 opment of the cranial sympathetic ganglia of the rat, included a 

 brief note on what was regarded as their probable origin. At 

 that time it was stated that the available series was not com- 

 plete in the early stages of the development of the olfactory sac 

 and that observations were made admittedly on limited material. 

 The conclusion attained was that the ganglion cells of the ner\ais 

 terminalis apparently arose in a proliferation from the septal 

 aspect of the olfactory sac, including the epithelium of the 

 vomeronasal organ. 



Subsequently the writer has been able to extend the series 

 through the addition of material drawn from four litters, taken 

 12 days 6 hours, 12 days 6^ hours, 12 days 18 hours, and 13 

 days 4 hours after insemination. Nine more embryos were 

 sectioned, making a total of sixty-eight available series.^ The 

 new material was fixed in the picro-aceto-platino-chlor-osmic 

 solution of V. Rath, following the procedure of Neal ('14), it 

 having been ascertained that the dark staining of the cytoplasm 

 of the developing neuroblast, together with the excellent cell- 



1 The embryological series studied are part of the collection of the Depart- 

 ment of Histology and Embryology. The writer appreciates the cooperation of 

 Professor Kingsbury in permitting their use in the present instance. The 

 writer likewise acknowledges the kindness of Professor Reed in criticising the 

 manuscript. 



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