The development and phosphatase activity in vivo and in vitro of the mandibular skeletal tissue of the embryonic fowl

Abstract
The palato-quadrate and femur developed high phosphatase activity. The membrane bone surrounding Meckel''s cartilage had a high phosphatase activity. During cultivation in vitro the explanted Meckel''s cartilage synthesised no phosphatase but the explanted palato-quadrates and femora did. Ossification centers developed in vitro in the mandibular meso-derm surrounding Meckel''s cartilage from 6-day embryos.