611.013 C280 v.3 Sabin, Florence Rena, 1871- On the fate of the posterior cardinal veins and their relation to tha development of the vena cava and azygos in the embryo pig. By Florence R. Sabin. With seven plates. (In Carnegie institution of Washington. Contribution to embryology. Washington, D. C., 1915. 30 x 23 cm vol. III, p. 5- 32. 7 pl.) Bibliography:p. 30