LYMPHATIC SYSTEM. 143 



The thoracic duct is not only joined by this trunk of the 

 lymphatics of the left arm, but also by the lymphatic vessels of 

 the left side of the thyroid gland, which appear at /, and by 

 the trunk of the lymphatics of the left side of the head and 

 neck, and also by those from the fore part of the lungs of the 

 same side ; but neither of these appear in this plate. 



The lymphatic vessels of the right side I have repeatedly 

 traced with great care, particularly from their having been 

 suspected to terminate in the subclavian vein, without reaching 

 the angle between it and the jugular ; but I have always dis- 

 tinctly seen them go precisely into the angle, not only in the 

 subject from which this plate was made, and which I now have 

 by me, but also in three others. When therefore these lym- 

 phatics are seen to enter the subclavian vein at any other part, 

 I should consider it as only an accidental variety, like the double 

 termination of the thoracic duct formerly mentioned. 



These lymphatic vessels of the right side form four consi- 

 derable trunks, which join near their termination. These 

 trunks are first, one from the upper extremity, which appears 

 at k, Plate III, lying above the clavicle between the subcla- 

 vian artery and vein ; this trunk is formed by the lymphatic 

 g, g, which comes up with the brachial artery, and the plexus 

 h, which likewise belongs to the arm, and passes under the 

 subclavian vein. Secondly, the trunk of the lymphatic vessels 

 of the right side of the head and neck which passes down on 

 the outside of the jugular vein, as is seen at /. Thirdly, a 

 lymphatic from the thyroid gland, which lymphatic is seen at 

 m, passing under the right jugular vein to get to the others. 

 Fourthly, the trunk of the lymphatics from the fore part of the 

 lungs of the right side, which trunk I have distinctly traced 

 under the subclavian vein to its termination, in common with 

 the others, at the angle between the jugular vein and the sub- 

 clavian. 



To finish this description, I shall observe that it is the more 

 necessary to understand the exact termination of these lym- 

 phatics of the right side, in order to explain how tumours 

 about this place, by compressing those vessels, occasion oedema- 

 tous swellings of the parts from which the vessels come, 

 without affecting the other parts of the body. 



