126 



water where it must remain during the injection. For filling the 

 vessels I tried a number of gelatine solutions and other fluids, but 

 found a warm five-percent solution of soluble Berlin-blue in water to 

 give the best results. 



The superficial vessels of the feet were injected by inserting a 

 pointed canula just through the dermis on the pads of the toes and 

 the metacarpus, and pushing it along about a centimetre in the sub- 

 cutaneous connective tissue. In each case for the space of about ten 

 minutes, from five to ten ccm of the fluid were forced gradually through 

 the canula by a hard- rubber syringe while the limb was massaged 

 gently from toe to the body. The vessels on the skin of the leg were 

 best distended by inserting the canula as obliquely and superficially 

 as possible beneath the dermis at several regions of the leg. 



By thrusting the canula into the muscles and tendons at various 

 points the deep system was partially filled. To inject the lymphatics 

 of the bones I found it necessary to break oft" the distal end of the 

 bone or bore a hole large enough to admit the canula which was 

 pushed nearly to the proximal end, and the fluid then slowly forced 

 in while the limb was artificially exercised. 



Vessels of the Thoracic Limb. 



The lymphatic network among the flexor tendons on the volar 

 aspect of the metacarpus, gives rise in the carpal region to several 

 vessels three or four of which curving to the cephalic aspect of the 

 leg unite into one or two trunks proceeding proximad with the cephalic 

 vein. A network of vessels in the subcutaneous connective tissue on 

 the dorsal aspect of the foot gives rise' in the carpal region to usually 

 two trunks which also lie near the cephalic vein. These several 

 trunks in the antibrachial region occasionally anastomose with each 

 other, and just before reaching the elbow one of them is joined by a 

 communicating branch from the deep system. 



In the distal half of the humeral region there are but two trunks, 

 one on either side of the cephalic vein. Near the shoulder these 

 break up into from three to five vessels which enter one of the two 

 or three cervical glands lying at the cephaHc border of the scapula. 

 These trunks carry the lymph from the skin of the foot and the distal 

 part of the forearm, and part of the lymph from the soft structures 

 of the foot. The lymph from the skin of the arm and shoulder flows 

 directly into the cervical glands. 



The deep system takes its origin in the network on the flexor 

 tendons. In the carpal region, this unites into a single trunk which 

 accompanies the radial artery, and anastomoses with the superficial 



