NERVE TERMINATIONS OF THE TADPOLE. 53 
The Nerve Terminations in the Cutaneous 
Epithelium of the Tadpole. 
By 
A. B. Macallium, B.A., 
Fellow of University College, Toronto, Canada. 
With Plate VI. 
I.—HIsTorIcat. 
Tue earliest recorded observations on the termination of 
nerves in the skin of the tadpole were made by Hensen! in 
1864. According to this observer a plexus of nerve-fibrils, 
situated immediately beneath the homogeneous membrane or 
larval corium, gives origin to fine fibrils, which pass through 
the membrane and terminate each in the nucleus of an epithe- 
lial cell. 
A little later Eberth? found the coarser nerve-fibres of the 
tail to end in a network of anastomising fibrils, situated some- 
what deeper than the plexus of Hensen. He was unable to 
trace any fibrils beyond this network although he observed 
them in the corium of the adult frog. 
In connection with these observations Eberth described 
structures of a peculiar nature which he discovered in cells of 
the epithelium of the tadpole. As these structures are of 
special interest, bearing on the subject of the present work, a 
brief abstract of Eberth’s description of them is here given. 
1 *Virchow’s Archiv,’ Bd. xxxi, p. 51; also, ‘Arch. fiir Mikr. Anat.,’ 
Bd. iv, p. 111. 
* * Arch. fiir Mikr. Anat.,’ 1866, Bd. ii, p. 490. 
