I) Ten days after a unilateral adrenalectomy had been performed on rabbits, the other adrenal gland was also removed and the consequent changes in the blood picture were observed.
1) The co m pletely adrenalectomized rabbits showed a gradual decrease in R. B. C. count, which reached its minimum in from one to two weeks. Recovery to th e normal level could not be obtained within one month.
2) The color index began to rise gradually a b out one week after adrenalectomy.
3) The reticulocytes increased after one week, and then returned t o normal.
4) As to the diameter of the erythrocytes, a shift to the right in the Price-Jones' curve was observed from about eight days after the adrenalectomy.
5) As for W. B. C. count, no remarkable change was obse r ved.
6) Neutropenia with relative lymphocytosis was reco g nized in the differential W. B. C. picture.
7) The eosinophils showed a slight increasing tendency.
8) In the bone marrow pictures, a decrease of erythroid cells, especially in immature erythroblasts was observed. As for the myeloid system, an increase in immature pseudoeosinophils and a decrease in mature ones were found. Histological examination of the bone marrow further revealed a remarkable hypopla sia of the erythroid system.
9) The rate of pseudoeosinophils with toxic granules showed marked increase about three weeks after the adrenalectomy; i. e.39.3% in the peripheral blo od and 22% in the bone marrow on the average. The toxic granules appeared in the myelocytes at the highest rate, and, in the other cells, they appeared in the following order: metamyelocytes, staff cells, and segmented cells.
II) Intravenous injection with anti-rabbit-adrenal guinea pig serum caused anemia, decrease in the pseudoeosinophil/lymphocyte ratio in the peripheral blood, and hypoplasia of the erythroid cells in the bone marrow. These changes are similar to those found in the adrenalecomized animals. Histologically, a remarkable degeneration of the adrenal cortex (zona glomerulosa and zona fasciculata) was observed in the rabbits treated with the antiserum.
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