Among the draft registrants examined during the spring of 1918 by the New York Hospital medical advisory boards there were 141 men with organic heart disease and ninety-three with what we will describe briefly as "tachycardias of unknown origin." Further Scrutiny of this latter group would probably have shown that a small number were early cases of Graves' disease (exophthalmic goiter) or tuberculosis, and that alcohol was the cause of the rapid heart rate in another small group. A surprisingly large proportion of the men suffering from circulatory disease, however, would be found in this group of what we have termed, for want of a better name, "tachycardias of unknown origin."
Fourteen of these men were examined a number of times, their histories being taken carefully and their circulatory reactions to graduated work being determined on at least three occasions. Chief importance will be attached to our objective findings, for