300 
on, after a few seconds or a few minutes, a very obvious 
wrinkling of the skin, a true cutis anserina. 7th. The 
nerves of the skin are not very favorably studied in the 
frog, especially their endings. 
Eberth, after several attempts, was obliged to give up the 
attempt to follow the nerves into the epidermis, and confine 
himself to those of the cutis, which he studied in Hyla. We 
may refer to Eberth’s previous papers on the ending of nerves 
in the tadpole’s tail, and also to some observations made by 
Dr. Klein, of Vienna, in which gold chloride was used, 
showing a remarkably fine network of nerves in the epider- 
mis. Eberth describes fine networks of nerves in the cutis 
of Hyla, but insists that these cannot be regarded as terminal. 
Stellate connective tissue corpuscles, remarkably like those in 
the frog’s cornea, and having the same apparent relation to 
the nerves, are described and figured; but Eberth does not 
find himself able to confirm his previous views as to the ter- 
mination of the nervesin such corpuscles, which he advanced 
in his paper on the tadpole’s tail (‘Archiv fiir Mikros. Anat.,’ 
Bd. ii). At the same time, though the cutis of Hyla does 
not confirm the existence of such a relation, Eberth cannot, 
in the face of repeated observation, deny the connection in 
the case of the tadpole’s tail. 
Researches on the Olfactory Mucous Membrane of the Frog. 
By Dr. Sigmuud Exner, Assistant in the Physiological Insti- 
tute, Vienna (‘ Sitz. der R. Akad. der Wissench.,’ vol. lxiii, 
part 1. Read December 15th, 1870). 
The author divides the nasal mucous membrane of the 
frog into three layers—Ist. The epithelial layer. 2nd. The 
subepithelial network. 38rd. The connective tissue layer, 
with its nerves and vessels. In the fresh condition the cells 
of the first layer are very soft and elastic, and like blood- 
corpuscles. ‘They present, on their outer surface, hairs, the 
longer of which are immovable, whilst the smaller give from 
forty-nine to sixty strokes in the second. The movement 
was not affected by the electric induction current, but the 
cells appear to stretch and return again to their original form. 
The fresh cells were examined in humor aqueus. 
Chromic acid, of 0°5 per cent., and, in other cases, osmic 
acid in saturated solution, were used for the observing the 
form of these cells. In concordance with Max Schultze’s 
observations, made on the same subject, Exner finds two 
kinds of cells, the one (epithelial-cells) having the front 
portion of the elongated cell-body of about the same width 
as the nucleus, and the hinder portion passing off into a 
narrower, but still tolerably thick prolongation ; whilst the 
