570 PHILOSOPHICAL TRANSACTIONS. [aNNO 1748. 



want of two regular jejuna ; for if these children had lived, each having its own 

 proper stomach, would probably have eaten a due quantity of food for its suste- 

 nance; and the office of the stomachs might have been well enough performed; 

 but each requiring a separate system of -intestines to dispose naturally of the 

 digested chyle, and this preternatural conjunction happening between them, the 

 jejuna of both were confused together; and having room in the abdomen, now 

 large and common to both, these parts of their organizations, that ought to have 

 grown into two guts of a considerable length, being hindered from a regular 

 accretion, the joint growing powers of both foraied the sack of communication; 

 which is proportionably capacious enough to answer the purposes of two natural 

 jejuna; below which the rest of the intestines of each child were sufficient to do 

 their several offices. 



In the lower part of this sacculus there was an outlet on each side, which were 

 the origins of their separate ilea; these were in a good state, and regularly in- 

 serted each into its coecum; and this in each had its natural appendicula; these 

 were regularly succeeded by their colons, and terminated by their proper recta 

 intestina to their natural outlets; with this difference only, that the colons were 

 out of their natural situation, and were convoluted in each child, by as narrow 

 portions of the mesocolon, as any part of the ileum is by its mesentery, and that 

 ^ low as the going off of the rectum. 



Of the vascular system. — As these children had but one abdominal cavity be- 

 tween them, so it contained in appearance only one liver, of a considerable size, 

 and an irregular form ; but this consisted of 1 in reality preternaturally joined, 

 as there were 2 gall-bladders. The umbilical vein is inserted into this, pretty 

 nearly in the usual manner, and afterwards this canal is divided into 1 branches, 

 "which carry the blood into the vena cava of each child, whence it falls naturally 

 Into the right auricles of their hearts. 



The heart of the larger child is but small, has a bifid apex, and from the divi- 

 sion has a vestige of the septum, on both the upper and under sides; which forms 

 a sulcus in a longitudinal direction, from between the apices to the basis; from 

 V whence arises a pericardium which extends itself over each side from the sulcus, 

 - 'and so forms a separate capsula over each ventricle of this heart, juid may there- 

 fore be called a double pericardium. -^ 

 '■ The ascending vessels are distributed according to the standard of nature; but 

 the descending trunk of the vena cava rides over that of the aorta, above the 

 going off of the emulgents, and sinks back again behind the external iliac artery, 

 before it is itself divided into iliac veins, descending naturally to the lower extre- 

 mities, as do the arteries from thence also. 



The kidneys, urinary and uterine parts were in a natural state, and the lungs 

 appeared well, and seemed as if this child had breathed. 



