LYMPHATIC SYSTEM. 139 



by the sides of the parotid and maxillary glands, and by the 

 sides of the large artery where it lies upon the chin, and by 

 the side of the occipital artery ; and I have seen one upon the 

 root of the mastoid process of the temporal bone. Those glands, 

 which accompany the lower part of the artery that runs upon 

 the face, are sometimes swelled in consequence of absorption 

 from the lips and the parts adjacent, and also from gum-boils; 

 and those which accompany the occipital artery are frequently 

 enlarged in consequence of the absorption of matter from 

 wounds of the scalp ; from which facts it is evident that the 

 external parts of the head are supplied with lymphatic vessels. 

 In quadrupeds I have distinctly seen those vessels, particularly 

 in a dog and in an ass, by passing a ligature round the large 

 blood-vessels of their necks immediately after killing those 

 animals. These experiments I made with a view to determine 

 whether the brain had lymphatic vessels, but I never yet have 

 been able to see any on that organ ; neither when I tied up 

 the lymphatics on the necks of those animals, and thereby 

 stopped the course of the lymph ; nor when I dissected the 

 human brain, which I have carefully done several times with 

 the view to discover those vessels, and have particularly sought 

 for them in the plexus choroides where they have been sus- 

 pected to be seen, and near the glandula pituitaria which is 

 supposed by some to be a lymphatic gland, but improperly, 

 since neither that gland nor the glandula pinealis agrees with 

 the lymphatic glands, as I shall show in the Third Part of these 

 Inquiries. 



But although lymphatic vessels have not yet been demon- 

 strated in the brain, it is probable, from analogy, that this 

 organ is not destitute of them ; and the following case affords 

 an argument in favour of absorption being carried on here by 

 lymphatics, as well as on other parts of the body. 



J. H., a young man of twenty-five years of age, by trade a 

 silk dyer, and whose father at that time laboured under a third 

 attack of madness, consulted me about a glandular tumour upon 

 the left side of his neck, of which he gave the following ac- 

 count : that for some time he had been troubled with an erup- 

 tion which had gone off and returned repeatedly ; that a week 

 after its last disappearance, he was seized with a fixed pain in 

 his forehead, for which he was bled ; that one day whilst at 



