611.013 C280 v.9 Sabin, Florence Rena, 1871- Studies on the origin of blood-vessels and of red bloodcorpuscles as seen in the living blastoderm of chicks during the second day of incubation. By Florence R. Sabin. (In Carnegie institution of Washington. Contributions to embryology. Washington, 1920. 29 x 23 cm vol. IX, p. 213-262. 1 illus., 6pl.) Bibliography: p. 257-258