The excellent physicist, Mr. Phil. Reis, of Friedrichsdorf, calls by this name his surprising invention for using the telegraph line to transmit really audible tones. Our readers will perhaps remember having heard some time since of this invention, the first trials with which Mr. Reis performed here in the Physical Society. Since then the invention has been constantly developed, and will, no doubt, become of great importance. [The lecture which followed this announcement was duly given on the 11th of May. In the Saalbau there is a suite of four rooms. The Lecture to the assembled members of the Hochstift was delivered in the Auditorium, at one end of the suite: the wires were passed through the two intervening rooms to the fourth chamber, where the transmitter was placed, the doors being closed. The battery and wires were borrowed from the Physical Society for this occasion, permission for their use having been granted on May 2nd, as appears in a formal entry in the minute-book. The following notice of Reis’s discourse, believed to have been written by Dr. Volger, Founder and first President of the Hochstift, appeared in ‘Didaskalia’ for May 14th.] [=4.=] TRANSLATION FROM ‘DIDASKALIA,’ 12TH MAY, 1862. Yesterday’s meeting of the Free German Institute was a very numerously attended one from the fact that the subject in the order of business, “Telephony by Transmission of the Galvanic Current,” as explained by the inventor himself, Mr. Phil. Reis, excites so great an interest that it rightly deserves the most general attention. In a lecture exceedingly interesting, universally understood, clear, and concise, Mr. Reis gave a historical outline of the origin and development of his idea of the practical possibility of the transmission of tones in a galvanic way. His first attempts were mostly unsuccessful in solving the cardinal question propounded by him. “How is it possible that a single instrument can reproduce at once the total action of all the organs operated in human speech?” Until finally it occurred to him to seek the solution of the problem in the question, “How does our ear take cognisance of the total vibrations of all the organs of speech acting at once?” or “How do we perceive the vibrations of several bodies sounding at once?” In order to answer this question the lecturer went more closely into the anatomy of the ear and into the formation of tones in general. After this was determined, he took up again his experiments in reference to the transmission of tones by means of galvanism. Afterwards Mr. Reis constructed considerably enlarged the parts of the ear necessary for hearing, by which it was finally possible for him to transmit the tones brought to the mechanically-imitated ear.