Abstract
MACROCYTOSIS OF THE ERYTHROCYTES IN PERNICIOUS ANEMIA Hayem,1an early student of the morphology of the blood, found very large erythrocytes in a case of severe anemia. His patient, probably suffering from pernicious anemia, had 414,062 red cells per cubic millimeter of blood with a hemoglobin value of 554,840 normal cells and a color index of 1.34. Eichhorst,2who wrote the first monograph on pernicious anemia, thought curiously enough, that microcytosis was the most characteristic finding in this disease, and Quincke,3another early student, considered poikilocytosis a characteristic feature. In 1876, Sorensen4described the blood conditions in pernicious anemia and made the following statement: On the contrary, I find the considerable size of the blood corpuscles fairly characteristic for I have not observed such in other morbid conditions and this forms a contrast to what occurs in chlorosis where, as mentioned, I often met with blood
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