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J. BEARD. 
chord and fuses with it (figs. 90, 91, 92, 93). I have not 
seen any reason for giving numerous figures of this point ; 
those represented appear to me sufficient for the purpose. We 
are now concerned with the rudiments of the branchial sense 
organs. These structures were first described for Mammals 
by Professor Froriep (No. 17), and very shortly after his dis- 
covery my own preliminary researches independently announc- 
ing almost the same facts for Elasmobranchs appeared (No. 5). 
In the full account I afterwards gave of them I also mentioned 
the finding of similar rudiments in three- days-Chick embryos 
(figs. 90, 91, 92, 93). Beraueck (No. 10) afterwards con- 
firmed the discovery, and Kastsclienko (No. 40) in the account 
he more recently gave of them, with his characteristic failing, 
conveniently forgot to mention that either Beraneck or I had 
ever seen the structures which he described. 1 
However, the following conclusions regarding the importance 
of the rudimentary branchial sense organs for the embryo 
Chick are peculiarly my own. 
We saw that in Elasmobranchii the fusion of the ganglionic 
Anlagen with the neuro-epithelium which forms the Anlagen 
of the branchial sense organs leads to a certain amount of 
ganglion form-elements passing from the neuro-epithelium to 
the main ganglion. Such portion is really the ganglion of the 
branchial sense organs or sense organs of the lateral line 
(figs. 92, 93) (lateral ganglion). 
It can be demonstrated also for the Chick that such form- 
elements pass by proliferation from the rudimentary sense 
organ into the ganglion (figs. 92, 93). This being so, and it 
being also capable of demonstration that the sense organs, with 
1 As Herr Kastsclienko quotes my paper, I presume he was aware of the 
discovery ; this conclusion is all the more justified as Professor Wiedersheim 
also briefly mentions my discovery in the last edition of his ‘ Lehrbuch der 
Vergleichenden Anatomie der Wirbelthiere ’ (p. 332). Professor Strasser 
also recently accuses Herr Kastschenko of a similar absent-miudeduess in 
connection with another matter (Strasser, “ Ueber die Methoden der Plas- 
tischen Reconstructionen,” ‘ Zeitschr. f. Wiss. Mikros.,’ Bd. iv, 1887, 
Hefte 2 and 3). 
