Departments of Transportation and Treasury and Independent Agencies Appropriations Bill

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 edition. Excerpt: ...frog tadpoles. The early retardation, the usual midlarval slowing ( critical point ), followed by slow growth, appears as in the frog tadpole (fig. 6). In this, my observations are somewhat at variance with those of Allen, who reports no retardation in the velocity of growth in hypophysectomized toads. Fuller reports may explain this essential difference in our results. I wish to emphasize, however, that the early retardation, the critical point, and the later period of slow growth are not so distinctly shown in the Fig. 3 Growth curves of hypophysectomized frog larvae supplied with fresh anterior-lobe substance, with aqueous extract, and with aqueous residue of the anterior lobe. The ordinates represent the total length of the larvae expressed in millimeters. Fig. 4 Growth curves of hypophysectomized frog larvae supplied with fresh anterior-lobe substance, with alcoholic extract and with alcoholic residue of the anterior lobe. The ordinates represent the total length of the larvae expressed in millimeters. Fig. 5 Growth curves of thyroidectomized frog larvae supplied with liver diet, hypophysectomized frog larvae supplied with fresh anterior-lobe substance. and with hypophysial colloid. The ordinates represent the total length of the larvae expressed in millimeters. Fig. 6 Growth curves of normal toad larvae supplied with fresh anterior-lobe substance, hypophysectomized toad larvae supplied with fresh anterior-lobe substance and with liver. The ordinates represent the total length of the larvae expressed in millimeters. toad as in the albinous frog larvae. This is also true of their response to a substitution diet of anterior-lobe substance. The growth rate of those toad albinos supplied with an...