Nachdruck verboten. 
The Histogenesis of Nerve. 
By J. Bearp, University of Edinburgh. 
Under the above title it is proposed to give a short account of 
researches carried out during the past two years. It was intended 
only to publish the work in its completed form, but the appearance 
of Prof. Dourn’s!) recent memoir served as a warning that an earlier 
publication was desirable, if the results were to lay claim to being 
more than a confirmation of DOHRN’S work. 
The correspondence in the fields of our labours is remarkably 
close. DoHrn’s publication not only covers a large portion of the 
ground gone over by me, but also specially treats of the lateral sense 
organs and the mode of origin of their nerves and ganglion cells: 
subjects which have also taken up much of my attention. Moreover, 
the title chosen by me some months ago for my work when com- 
pleted (viz. Ganglion cells and nerves), is to all intents identical with 
that of “Studie No. 17”. 
Donrn, in this latter study, speaks of work on the transient 
ganglion cells”), a circumstance which led to the publication by me 
of a preliminary paper in a recent number of this journal on the 
curious conditions revealed by these structures in Raja 3). 
1) Dourn, A., Studien etc. No. 17, Nervenfaser und Ganglienzelle, in: 
Mitteil. a. d. Zool. Station zu Neapel, Bd. 10, Heft 2. 
2) Op. cit. page 310. “Ich hatte bereits . . . einen Exkurs auf die 
Verhältnisse des Centralnervensystems gemacht und speziell die Bildung 
und Beziehungen der sog. riesigen Ganglienzellen der Selachier und von 
Lophius piscatorius untersucht. Aber die Fortsetzung dieser Studien hat 
mir so unerwartete Zustände der Ontogenese des Medullarrohres, wenigstens 
bei Selachiern und Teleostiern, offenbart, daß ich es vorziehe” etc. 
3) The paper on the transient ganglion cells and their nerves (Anat. 
Anz. 1892, pp. 191—206) was written after, and as the concluding section, 
of the present publication. As it could not be expected that the whole 
would be published in one number, a change in the order of appearance 
was made from motives of expediency. Ronon’s work (Zur Histiogenese 
des Riickenmarkes der Forelle, Sitzungsberichte d. math.-physik. Klasse 
d. Kgl. bayr. Akad. Miinchen 1884) escaped my notice until quite recently. 
In it the topography of the transient ganglion cells is described. I regret 
having to postpone further notice of Romon’s memoir. It may be added 
that from as yet incomplete observations on embryo and adult Lophius 
piscatorius I conclude the giant cells described by G. Fritsch to be a 
