The ribs in both Chang and Eng were 22 in number, 7 true and 4 false. On the right side of Eng the first, second, and third ribs were normal. The fourth, fifth, sixth, and seventh presented diminished intercostal spaces, owing probably to the extreme traction made on them by the deflection of the ensiform cartilages. The intercostal space between the third and fourth ribs was slightly contracted; that between the fourth and fifth ribs was very much contracted, the muscle being bulged inward. Between the fifth and sixth, and sixth and seventh ribs the space was less contracted. The remaining intercostal spaces were about normal. The fifth rib near its articulation with the vertebral column formed a well-defined ridge within the thorax, carrying with it the sixth and seventh ribs, thus forming a rounded elevation, distinguishing the positions of these ribs from the thoracic wall above and below this point, where the parietal surface presented the usual concave appearance. On the left side of Chang a similar arrangement of ribs and intercostal spaces was seen to the above. The remaining organs were not examined. REMARKS. With reference to the cause of death of the Siamese twins it may be briefly said that, in consequence of the restrictions by which we were bound, no examination of the brains was made. It cannot, therefore, be proved that the cause of Chang’s death was a cerebral clot, although such an opinion, from the suddenness of death, preceded as it was by hemiplegia and an immediate engorgement of the left lung, is tenable. Eng died, in all probability, in a state of syncope induced by fright—a view which the over-distended bladder and the retraction of the right testicle would appear to corroborate. The existence of lateral curvature was not unsuspected. It was known to those who had examined the twins before death. Indeed, it must have been a necessity of the acquired position. The presence of a pad of subperitoneal fat at the usual position of the umbilicus was certainly curious. It would appear to be an example of a localized nutritive change about the peritoneum, at the centre of the umbilical region, anticipating the exit of the vessels of the cord at that point. Familiar examples of this anticipation between structures developing from different layers of the embryo are seen in malformations of the genital organs, eye, ear, etc. In the above example it is remarkable only from the rarity of the conditions yielding it. The circulation in each individual of the twins was practically complete, since the demonstration of continuity between the portal systems, although satisfactory, invites the conclusion that the amount of blood which passed from one to the other side of the band must have been, in the condition of the parts at the time of the demonstration, very inconsiderable, and was not competent in all probability to modify the performance of any act of the economy.