MEMOIRS. 
New Observations upon the Minute Anatomy of the 
Papilljeo/ Me Frog’s Tongue. By Lionel S. Beale, 
M.B., F.R.S., Fellow of the Royal College of Physicians, 
Professor of Physiology anil of Geueral and Morbid Ana- 
tomy in King’s College, London ; Physician to King’s 
College Hospital, &c. 1 With Plates I — IV. 
In this paper I propose to give the results of some recent 
investigations upon the minute anatomy of the beautiful 
fungiform papillae of the tongue of the little green tree-frog 
(Hyla arborea). The specimens have been prepared accord- 
ing to the principles laid down in former communications. 
The success I have met with in this and other minute anato- 
mical inquiries is, I believe, almost entirely due to the pro- 
cess of investigation which I have adopted for some years 
past, and which enables me to render specimens very trans- 
parent, and to demonstrate all the tissues in one specimen, 
a result which, as far as I am aware, can be obtained in no 
other way. By this plan sections are obtained so exceedingly 
thin, without the destruction even of the most delicate tissues, 
that they may be examined under the highest powers which it 
is possible to obtain ( T V magnifying 1700 linear, and magni- 
fying about 3000 linear). 
The following are among the most recent contributions to 
the anatomy of the papillae of the frog’s tongue : 
W aller : “ Minute Structure of the Papillae and Nerves 
of the Tongue of the Frog and Toad,” ‘ Philosophical Trans- 
actions,’ 1847. 
Billroth : “ Ueber die Epithelzellen der frosch-zunge, 
sowie liber den Bau der cylinder-und flimmerepithelien unci 
ihr Verhaltniss zum bindegewebc,” ‘ Archiv fur Anat. Phvs.,’ 
1858, S. 163. 
Hoyer : “ Mikroskopiche Untersuchungen iibt?r die zunge 
des Froschcs,” ‘Archiv fur Anat. Phys.,’ 1859, S. 488. 
1 This paper has been reprinted from the ‘Phil. Trans. but lias been 
carefully revised by the author for this Journal. Several additions have been 
made to it, and a new figure added. 
VOL. IX. NEW SER. 
A 
