H NUN Mp 
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|] eX i 
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Fic. 1.—a. Epithelial, and 4, Smelling-cells in continuity with Exner’s 
network, ec. 
Fic. 2.—A transition form of the olfactory cells :—the hair-like fringe is 
broken away. 
The Nature of the Influence of Nerves on Gland-cells, as illus- 
trated by the Cutaneous Glands of the Frog.—I'wo papers have 
recently appeared of considerable physiological interest in 
relation to the ‘gland and nerve’ question, one is by Engel- 
mann, of Utrecht, in Pfliiger’s ‘Archiv.? The other a 
separate work on the ‘Skin of the Frog,’ is by Professor 
Eberth, of Zurich (see above). It has long been known that 
some of the cutaneous glands of the frog are contractile, and 
their structure has been very carefully studied with not quite 
concordant results by Stieda, Ciaccio, Szczesny, Leydig, and 
Hensche. Engelmann finds that if the foot of Rana escu- 
lenta be spread out so that the small glands in the swimming 
membrane are observable, and the sciatic nerve in the thigh 
be then irritated by the induction-current, a contraction of the 
glands is at once observed, the lumen almost disappearing and 
the cells of the gland altering their form. 
Engelmann found that the administration of curare does 
not affect this phenomenon, so that the experiment may be 
very easily made on curarized frogs. He seems to have 
‘I have repeated Engelmann’s observations, obtaining a very sudden 
en eaeg of the gland so that the secretion is sharply spurted out.— 
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