III. The Carbon Telephone IN the columns of this journal (NATURE, vol. xvii. p. 512) the present writer remarked in the early part of the year “that it was unlikely the telephone of the future would employ the voice to generate the driving power, as it does in the magneto-telephone, but only to modulate the flow of a current obtained by coarser means. It is in this direction that Mr. Edison is working, and his practical triumphs in the past are the earnest of success to those excellent telephonic investigations wherein he has already won an enduring fame.” Since those words were written Mr. Edison has brought his telephonic experiments to so successful an issue that his carbon transmitter and his new receiver leave little to be desired in electric telephony, except the automatic record of the received speech, and this, it is not impossible, may ere long be accomplished.