202 ESSAYS AND OBSERVATIONS 



tius * himfelf feems to have pointed ouc 

 from whence this miftake has probably 

 arifen ; for he fays the dilatation of the 

 vciTels there produces that fort of tu- 

 mor called " Brouchocele." In pra(5lice, 

 we daily meet with tumors which go 

 by this name, which have a flrong and 

 evident pulfation refembling that of aneu- 

 lifms, for which I have more than once 

 miftaken them, till I examined them more 

 narrowly. Thefe tumours are generally 

 produced by a fwelling of the thyroid, 

 gland which is fupplied with a large ar- 

 tery on each fide ; and, when they be- 

 come large, they likewife otten prefs more 

 or lefs on the carotid arteries, and are 

 atfedled by their pulfations. But, altho^ 

 aneurifms of the neck are not frequent, 

 as many of the older authors alledge, yet 

 they have been fometimes feen in this 

 part ; as the obfervations related by Mr 

 Littre in the Memoirs of the Academy of 

 Sciences, and by Dr Dod in the Philofo- 

 phical Tranfadlions, of procelles from the 



dilated 



* Art, meilc, princfp, Aeclus Tetrab- 4, ferm^ 3. 



cap. 10. 



