In the fœtal and early period of extra-uterine life the vessels must have been more capacious, and associated with a large tract of liver tissue. It follows, all things being equal, that an attempt at division of the band in early life would have been accompanied with more venous hemorrhage than at any subsequent period. In proof that the twins were the product of a single conception, the strict correspondence between the markings of the two spleens, as well as the number of the ribs, may be observed. The absence of available data bearing upon the question of symmetry between visceral organs of twins, prevents us from drawing here too positive an inference. It is probable, however, that the twins were individuals of a single organism, remarkable for its complete expression of duplex bilaterality.[5] ----- Footnote 5: I desire to return thanks to Dr. T. H. Andrews and Dr. J. W. White, Jr., for important assistance rendered in preparing the notes of the autopsy. ----- [Illustration Figure 19: Fig. 19. Foreshortened view of the trunks, showing in the acquired position the band from above and the contours of its lateral surfaces. ] DESCRIPTION OF FIGURES. FROM PHOTOGRAPHS. Fig. 1. Twins in acquired position (E. R., C. L.). Taken in St. Petersburg, 1870. Page 3. Fig. 2. Twins in acquired position (E. R., C. L.). Taken after death at Philadelphia. Page 8. FROM SKETCHES. Fig. 3. The surface, C. R., E. L., exposed by removal of skin and superficial fascia to display the tendons of the external oblique muscles and adjacent parts. Page 12. A. The superficial fascia—lost over the position of Chang’s umbilical pouch. B, C. Supplemental layers of fibrous tissue of Eng not seen in Chang; B is a continuation toward Eng of aponeurotic fibres having a source from the linea alba of Chang; C is independent of the former, and is continuous with the deep pectoral fascia. D. The interlacing of fibres on tendon of external oblique muscle of Chang. E. The linea alba of Chang, beginning at C. R. F. Its continuation to E. L., and insertion upon the ensiform cartilage. Fig. 4. The umbilical ligament in Eng. Page 15. A. The umbilical ligament. B. The lobule of fat at position of normal umbilicus. Fig. 5. The umbilical ligament in Chang. Page 16. The letters as in Fig. 4. Fig. 6. The abdominal organs of Eng—the small intestines removed. Page 17. A. Left lobe of liver. B. Right lobe of liver. C. Gall-bladder. D. Suspensory ligament. E. Lobules of fat in the position of the termination of the umbilical ligament.