The elements of medical chemistry : embracing only those branches of chemical science which are calculated to illustrate or explain the different objects of medicine, and to furnish a chemical grammar to the author's Pharmacologia . of under it, no sensation is excited so longas the metals are kept apart; but, on bringing theminto contact, a metallic taste is distinctly perceived, andif a connexion be made with these metals and the globeof the eye, by means of a metallic wire or rod, a flash oflight will be perceived at the same instant. 397. In the above experiment we have an example o
The elements of medical chemistry : embracing only those branches of chemical science which are calculated to illustrate or explain the different objects of medicine, and to furnish a chemical grammar to the author's Pharmacologia . of under it, no sensation is excited so longas the metals are kept apart; but, on bringing theminto contact, a metallic taste is distinctly perceived, andif a connexion be made with these metals and the globeof the eye, by means of a metallic wire or rod, a flash oflight will be perceived at the same instant. 397. In the above experiment we have an example of thearrangement of two perfect conductors [silver and zinc) withone imperfect one [the saliva.) The metallic taste is theeffect of a smsd quantity of electricity thus excited, and itsaction on the nerves of the tongue. Exp. 54.—Take the lower extremities of a recently killedfrog, and arm the crural nerve with a piece of zinc, ortin foil; at the same time bring the muscular parts ofthe animal in contact with a piece of silver. As soonas the two metals are made to touch each other, or acommunication is established between them by meansof a metallic conductor, violent convulsions are pro-duced. iUKIsS MEDIOAL 201. $98. Upon the discovery of this singular fact, Physiologistshastily adopted the opinion that the source of nervous influenceWas electricity, and the most sanguine expectations wereentertained, that the nature and operation of this mysteriouspower would be at length developed by this new train ofresearch. It is a curious fact in the history of science, thatan experiment so full of promise to the physiologist shouldhave hitherto afforded him little or no assistance, while thechemist, to whom it appeared to offer no point of interest,has derived from it a new and important instrument of re-search, which has already multiplied discoveries with suchrapidity, and to such an extent, that it is impossible to antici-pate the limits of its power. 399. The applicatio
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