IN reference to Lord Rayleigh's very interesting note in your issue of June 18, we have, for several months, had preliminary experiments in progress, with the object of educing practical proof of the effects of thermo-electric currents upon the conductivity of alloys; but, owing to the stress of routine work in our respective departments, the research was not sufficiently advanced for publication. We had hoped, however, to be able to read a short note immediately after the long vacation.