STUDIES ON AGLOMERULAR AND GLOMERULAR KIDNEYS

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Abstract
A comparative study of the anatomy and physiology of the tubules of the aglomerular and glomerular vertebrate kidney, involving analyses of simultaneously taken blood and urine from 4 genera of teleostean fish as well as observations of the tubule after intravascular and intraperitoneal injection of the dye tetrachlorphenolsulphonephthalein, together with other data, indicates that the tubules and not the glomeruli are phylogenetically the more important if not the chief structures in the elaboration of urine. The proximal convolution or its equivalent seems definitely to be the secretorily active part of the vertebrate tubule. Aglomerular kidneys, differing from each other and from partly glomerular ones chiefly in the amount and distribution of afferent venous blood, show a conspicuously larger output of urine per day than those with the greater afferent venous supply. This fact is made the basis of reference to the possible functional significance of the carefully controlled venous blood supply to the mammalian tubule proper.

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