2 
Axel Key : “ Ueber d. Endigungen d. Geschmacksnerven 
in der zunge Frosches,” ‘Muller’s Archiv,’ 1861, S. 329. 
Hartmann: “ Ueber die Endigungsweise der nerven in 
den Papillae-fungiformes der Froschzunge,” ‘ Archiv fiir Anat. 
Phys.,’ 1863, S. 634. 
Engei.mann : “ On the Terminations of the Gustatory 
Nerve in the Frog’s Tongue,” ‘Siebold und Kolliker’s 
Zeitschrift,’ Bd. xviii, heft i. 
In Part I of ‘ Max Schultze’s Archiv ’ for 1868 will be 
found “ A Memoir on the Taste Papillae of the Tongue,” by 
Dr. Christian Loven, translated from the Swedish, to which 
attention may be directed. The author records the demon- 
stration of some peculiar cells which are probably connected 
with the sense of taste in the higher vertebrata. The cells in 
question, which are interspersed amongst the ordinary 
epithelial cells, perhaps correspond with the mass of cells of 
the papillae of the frog’s tongue described in this paper, which 
are, without doubt, very intimately connected with the nerve- 
fibres of the plexus, which I have demonstrated, at the 
summit of the papilla. 
Although the views of Axel Key are supported by 
schematic figures which do not accurately represent the real 
arrangement of the tissues, they approach much nearer to the 
truth than those of other observers. He describes two kinds 
of cells at the summit of the papilla, epithelial cells and special 
cells concerned in taste. I have not been able to verify his 
statements in this particular. He has not demonstrated the 
peculiar network at the summit of the papilla which is seen 
so distinctly in my specimens, and his delineations of the pro- 
longation of the axis-cylinder alone, and its division into 
fibres far too fine to be visible by the magnifying powers 
employed, and the abrupt cessation of the white substance 
delineated by him, are evidently schematic, — indeed, he does 
not pretend that the figures referred to are copies from nature. 
Still his inferences regarding the division of the nerve-fibres 
into very fine fibres which pass into the epithelium-like tissue 
at the summit of the papilla, approach much nearer to the 
actual arrangement than those of any other observers with 
which I am acquainted. 
Among the later researches upon the mode of termination of 
the nerves are those by Dr. Hartmann. These are concluded in 
the number of Reichert and Du Bois-Reymond’s * Archiv’ for 
1863. The drawings of the papillae accompanying this memoir, 
especially fig. 65, PI. 18, which I have copied (see fig. 24, 
PI. IV, of this memoir), form an excellent illustration of the 
