This study is primarily concerned with the question of normal blood pressures and pulse rates under varying conditions. The observations on patients cover only a restricted field and are introduced, in the main, as illustrations of the deductions which may be drawn from comparison with the normal data. The work falls naturally into two parts, one, the measurement of the level of pressure and pulse rate under fixed conditions, with which this paper is concerned; the other, the measurement and interpretation of the changes in pressure and pulse rate induced by alteration of the conditions, which are dealt with in a succeeding paper. Most of the observations were made on soldiers at Camp Lewis, Wash. For the opportunity to do this work I am indebted to Dr. Kerr, who was in charge of the medical division of the Base Hospital, to Dr. Northington and Dr. Fulton who were successively in