. A text-book of physiology : for medical students and physicians . e relationship betweenaltitude and amount of hemoglobin is given in Fig. 185a. Ac-cording to another set of observers, the increase in the numberof red corpuscles is due to a concentration of the blood. Theblood-plasma is reduced in quantity, perhaps by transuda-tion of water into the tissues, and, therefore, the number of redcorpuscles and the amount of hemoglobin become greater for eachcubic millimeter. If we assume that this smaller bulk of blood,more concentrated in corpuscles and hemoglobin, circulates * Viault, Comptes r
. A text-book of physiology : for medical students and physicians . e relationship betweenaltitude and amount of hemoglobin is given in Fig. 185a. Ac-cording to another set of observers, the increase in the numberof red corpuscles is due to a concentration of the blood. Theblood-plasma is reduced in quantity, perhaps by transuda-tion of water into the tissues, and, therefore, the number of redcorpuscles and the amount of hemoglobin become greater for eachcubic millimeter. If we assume that this smaller bulk of blood,more concentrated in corpuscles and hemoglobin, circulates * Viault, Comptes rendus de lacademie des sciences, 1890 and Kemp, American Journal of Physiology, 10, 34, 1904. GENERAL PROPERTIES: THE CORPUSCLES. 441 more rapidly, then also the oxygen-carrying capacity of theblood is increased. In favor of this view, Abderhalden, for in-stance, has claimed that if animals of the same species and samelitter are bled to death and the total quantity of hemoglobinis estimated, the average figures obtained for the animals at low Atmospheric pressure in mm of mercury. Fig. 185 a.—To show the relationship between altitude and the percentage of hemoglobinin the blood. Figures along the bottom give the atmospheric pressure; along the ordinate tothe right the altitude in feet, and along the ordinate to the left the percentage of hemoglobin.— {Fitzgerald.) levels are the same as for those at the high altitudes. Zuntz has,however, called attention to the fact that when Abderhaldensfigures are estimated per kilogram of weight they show an in-crease in total hemoglobin in the high altitudes, and he and otherobservers have obtained similar results. It seems certain, there- 442 BLOOD AND LYMPH. fore, that high altitudes cause eventually a marked increase inthe production of red corpuscles, but the very sudden changesof this kind reported by some authors as happening within a fewhours must be considered as apparent rather than real, and areto be expl
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