Extensive degeneration with marked sclerosis of Goll. Extensive, but less sclerotic degeneration of Burdach. A narrow band of almost normal white tissue persists at the gray commissure and bordering the post. horns. The root zone and Lissauer are practically free. Extensive degeneration of the lateral tracts, old and recent, as indicated by the dense whiteness and the cribriform appearance, respectively. Slight degeneration in one direct pyramidal tract. The gray matter, cells in ant. horns, Clark's nucleus, normal. ARTICLE III. DEMONSTRATION OF A MODEL OF THE THORACIC AND ABDOMINAL VISCERA PREPARED FROM A HUMAN SUBJECT HARDENED IN FORMALIN. BY JOHN WARREN, M.D. OF BOSTON. JUNE 11, 1902. DEMONSTRATION OF A MODEL OF THE THORACIC AND ABDOMINAL VISCERA PREPARED FROM A HUMAN SUBJECT HARDENED IN FORMALIN. THIS model was made during the winter of 1902 in the Anatomical Department of the Harvard Medical School. A few years ago, a model of the abdominal viscera was made under the direction of Professor Dwight by this same method. This model was enlarged three times on a linear scale, and was intended for use in the lecture room; later four smaller models of actual life size were made for section teaching. These models were so successful that we attempted this time to make a model of the entire trunk with the thoracic and abdominal visera in situ. The method of preparation was as follows. The best subject then on hand was selected. It was an adult male about 65 years of age, muscular and apparently well nourished. The body was hardened by successive injections of formalin, which was allowed to move very gradually into the right femoral artery; about four and one-half quarts were used in four strengths of 10, 25, 35, and 50 per cent. respectively. This method of hardening subjects by formalin is a well-known one, and has been used extensively by Prof. Cunningham of Dublin and Prof. His of Leipzig. It was also used by Prof. Dwight to prepare the models made here previously. It is the best method of obtaining the exact shape and position of the various organs, and their relations to each other, and is especially useful in the study |