ABSTRACT
Since the gases have widely different conductivities under the X-rays, it is to be expected that the rate of recombination is different for the various gases. Two distinct methods of determining the duration of the conductivity were used, both of which gave consistent results they are By blowing air at a known velocity along a tube, and testing the conductivity at different distances from the point of action of the rays and By applying an electromotive force to the gas at definite intervals after the rays have ceased, and measuring the quantity of electricity that passed through the gas. It includes written in New Zealand, at the Cavendish Laboratory and during the Montreal period, as well as an introduction to Rutherford's early work by Sir Edward Appleton, and some reminiscences of his time in Canada by Professors H. L. Bronson and Otto Hahn.
