LYMPHATIC SYSTEM. 141 



cles ; and the other which accompanies the large arteries, and 

 belongs to the parts deeper seated. 



The superficial set of lymphatic vessels may be discovered in 

 emaciated dropsical subjects, by a careful dissection on the fore 

 and back part of the arm, where I have fixed pipes into them 

 and have injected them with mercury. In Plate IV, fig. 1, they 

 are seen running on the back part of the fore arm as at 0,0,0, 

 most of them passing on its outside, and twisting to the fore 

 part, near the head of the radius, as at b. But there is one 

 vessel in this preparation which passes towards the inside, 

 under the inner condyle of the os humeri at c, and sends a 

 branch amongst the muscles, which branch perforates the in- 

 terosseous ligament, getting between the radius and ulna to the 

 fore part, where it joins a deep-seated one that had accompanied 

 the radial artery. 



In Plate IV, fig. 2, the lymphatic vessels are seen on the fore 

 part of the upper extremity; those superficial branches which 

 passed on the outside of the back to the fore arm appearing now 

 on the fore part at b and ascending under the skin that covers 

 the supinator longus and the biceps, they enter some glands in 

 the axilla at /, /, whilst that vessel which passes on the in- 

 side of the back of the fore arm under the internal condyle, 

 appears on the fore part at c, and just above the condyle 

 enters a gland d, and then passes up on the inside of the arm, 

 communicating with a lymphatic from the fore part of the 

 wrist, and passing to the axillary glands. 



A superficial lymphatic vessel is seen under the skin, on the 

 fore part of this extremity just above the wrist ; a pipe was in- 

 troduced at 0, and the lymphatic thereby injected with mercury. 

 This vessel passes under the integuments over all the muscles, 

 and joins the lymphatic from the back part of the fore arm at e, 

 and there forms a plexus which passes under the integuments, 

 on the inside of the arm to the axillary glands at /. 



Besides these superficial lymphatic vessels upon the upper ex- 

 tremity, I have traced a deeper-seated one near the radial artery, 

 and have injected it from a pipe fixed at g. This lymphatic 

 vessel accompanies the radial artery, and passes, first under the 

 inter osseous, and then under the ulnar artery, which in this sub- 

 ject runs over the muscles. Near the part where the lymphatic 

 passes under the interosseous artery, it receives the branch (as 

 formerly mentioned) from the back of the fore arm. After pass- 



