“…In an attempt to determine in how far anoxemia may be responsible for changes in conduction through the ventricles, I have measured the QRS intervals in the records taken with lead II in the experiments previously reported (Resnik, 1925). The methods of the experiments have been fully described in the above paper, and it need only be mentioned that the pericardium was unopened in all the present experiments, and that the animals were completely under the influence of atropine.…”