will be always with us. The man of business will possess many conveniences denied to the city man of to-day. It is, for instance, to be supposed that the inordinate defects of even the best telephone systems will be eliminated. When wireless communication of ideas has been perfected, of course the telephone exchange will disappear. Differential "tuning"--the process by which any wireless telephone will be able to be brought, as transmitter, into correspondence with any other wireless telephone, as receiver--will enable every merchant to "call up" every other merchant. Instead of, as at present, looking up his associate's number in the directory, and getting connected by the clumsy junction of wires at an exchange office, the merchant will look up the tuning-formula, adjust his own telephone to it, and ring a bell, or otherwise employ means for attracting the attention of the man he wants to speak to. As a great proportion of all the business transacted will be done by telephones the frequent occurrence of disputes as to what has or has not been said in a given conversation will have rendered safeguards necessary. Consequently, every telephone will be attached to an instrument, developed from the phonograph, which will record whatever is said at both ends of the line. Precautions will have to be devised against eavesdropping. After communication is established, probably both parties to a conversation will retune their instruments to a fresh pitch, which, in cases requiring special secrecy, could be privately agreed upon beforehand.