Under this name, and under the name of Möller-Barlow's disease, a condition has been described in which a hemorrhagic effusion takes place under the periosteum, which is quite rare, but nevertheless interesting. Six cases of this rare disease have recently been recorded by Brun and Renault, of Paris, in La Presse Médicale, Jan. 12, 1898. These six cases were observed in the Hospital for Children's Diseases during the past two years. The first case was that of a girl of three months. The father and mother were healthy, but a younger brother had died in convulsions. The child was born at term after a normal labor and had been nursed for six months. It was brought to the Hospital because of the swelling of the right thigh. The general appearance of the child was good. The fontanelle, however, was wide open, but there was no cranial tabes, no thoracic deformity