For a number of years, there have appeared from time to time books by various authors purporting to give to the reader a complete understanding of blood pressure, the causation and the measuring of changes in the various factors, and the blood-pressure conditions to be found in all diseases. Independent observers have also put forth formulas for the determination, by means of blood-pressure estimation, of cardiac efficiency.
Recently I have had the opportunity of studying blood-pressure findings in a large number of army officers and candidates for commissions in the army, chiefly in men over 30 years of age, medical officers being in a large majority. I am not here presenting statistics as to the distribution of these cases among different age periods, or as to the classifying of the blood-pressure readings obtained; for, while these figures might be of interest, it does not seem to me that such statistics