avery's own farrier. 139 



and carried by the blood vessels into the lungs, "where 

 all the blood passes many times every hour, and there 

 undergoes a change," by exposure to air, &c. j therefore, 

 it is of permanent importance to preserve the blood in a 

 healthy condition, because the blood is the vital fluid 

 and principle of life; and when it is affected, the whole 

 organization is affected also. When this poison enters 

 the circulating fluid, then it is that this disease begins 

 to become general, and loses the title of the local one. 

 Diseased particles being carried into the lungs with the 

 blood, these oigans are next to suffer from this poison, 

 whence arise little tubercles on them; after the forma- 

 tion of which, there may be seen very small ulcers and 

 purple spots on the inside of the nostrils. The matter 

 discharged from these is more varied in color and con- 

 sistence — that is, more purulent at times, and gluey or 

 streaked with red at others, which mislead as to the 

 character of this disease. 



Here is a very critical period of this disease. It is 

 either carried now by the large blood vessels to the head, 

 when the brain becomes the principal seat and sufferer 

 (of which I shall speak hereafter) or it is taken along 

 by the absorbents to the extremities. " Along the 

 course of these absorben's are natural valves of the lining 

 membrane thereof, which are pressed against the sides 

 of the vessels, and permit the fluid to pass in a direction 

 towards the chest, impeding its progress from the chest." 

 This poisonous matter, coming in contact with these 

 sensitive organs, excite and cause them to become in- 

 flamed and swollen, which makes them appear like 

 corded veins that rise up and break, from which oozes 



