300 PRACTICE OF PHYSIC. 



in the rest of the system. The last certainly takes place when 

 the haemorrhagic effort is communicated to other parts of the 

 system, and produces haemorrhagies there. In such cases it 

 is obvious that venesection is a proper remedy. The common 

 principle on which it is practised here, is for the purpose of re- 

 vulsion ; for which I have found very little foundation on any 

 occasion." 



CHAP. IX, OF SYMPTOMATIC H.&MORRHAGIES. 



MXV. I have thought it very improper, in this work, to treat 

 of those morbid affections that are almost always symptomatic 

 of other more primary diseases ; and this for several reasons, 

 particularly because it introduces a great deal of confusion in 

 directing practice, and leads physicians to employ palliative 

 measures only. I shall here, however, deviate a little from my 

 general plan, to make some reflections upon symptomatic hae- 

 morrhagies. 



MX VI. The haemorrhagies of this kind that especially 

 deserve our notice, are the Hsematemesis, or Vomiting of Blood ; 

 and the Hsematuria, or the Voiding of Blood from the urinary 

 passage. Upon these I am here to make some remarks ; be- 

 cause, though they are vary generally symptomatic, it is possible 

 they may be sometimes primary and idiopathic affections; and 

 because they have been treated of as primary diseases in almost 

 every system of the practice of physic. 



SECT. I. OF THE H^MATEMESIS, OR VOMITING OF BLOOD. 



MXVII. I have said above in DCCCXLV., in what 

 manner blood thrown out from the mouth may be known to 

 proceed from the stomach, and not from the lungs : but it may 

 be proper here to say more particularly, that this may be certain- 

 ly known when the blood is brought up manifestly by vomiting 

 without any coughing ; when this vomiting has been preceded 

 by some sense of weight, anxiety, and pain, in the region of the 

 stomach ; when the blood brought up is of a black and grumous 



