“DEAR PROF. HUGHES: I have now in the press a history of Wireless Telegraphy from 1838 to 1899, and in writing to Sir William Crookes for information he tells me that many years ago he saw some experiments of yours with the microphone, in which you signalled from one part of a house to another without connecting wires, and he desires me to refer to you for particulars. I think, with Sir William, that it is a pity you have not hitherto published your results, and I sincerely hope you will now do so. If also you would kindly favour me with a short account, I could find room for it in my book, which is now in the printer’s hands.--Sincerely yours, J. J. FAHIE. Claremont Hill, St. Helier’s, Jersey, April 26, 1899.” _Reply from Prof. D. E. Hughes_:-- 40, Langham-street, W., April 29, 1899. DEAR SIR: In reply to yours of the 26th inst., in which you say that Sir William Crookes has told you “that he saw some experiments of mine on aërial telegraphy, in about December, 1879, of which he thinks I ought to have published an account,” and of which you ask for some information, I beg to reply with a few leading experiments that I made on this subject from 1879 up to 1886:-- “In 1879, being engaged upon experiments with my microphone, together with my induction balance, I remarked that at some time I could not get a perfect balance in the induction balance, through apparent want of insulation in the coils, but investigation showed me that the real cause was some loose contact or microphonic joint excited in some portion of the circuit. I then applied the microphone in the circuit, and found that it gave a current or sound in the telephone receiver, no matter if the microphone was placed direct in the circuit, or placed independently at several feet distance from the coils, through which an intermittent current was passing. After numerous experiments, I found that the effect was entirely caused by the extra current produced in the primary coil of the induction balance.