i68 Dr. Pearson on the colouring Matter 



Farther investigation has shewn, that this coaly matter does 

 exist in domesticated brute animals ; but as they die, or are 

 killed generally before they attain to twenty years, or even 

 fifteen years of age, the organs in question are seldom seen 

 blackened. However, in diseased conditions, the cases are 

 not according to this rule. With the approbation of Professor 

 CoLMAN and Mr. Sewel, several of the worthy students of 

 the Veterinary College have frequently obliged me by fur- 

 nishing, for my examination, the lungs of horses and asses. 

 In general, the bronchial glands were merely white, or red- 

 dish ; but now and then they were partially black. In one 

 instance of an ass, only six months old, these glands were 

 black from coaly matter ; but the lungs were uniformly red. 

 The animal had died of peripneumony. In no instance have 

 I seen, in any brute creature, the lungs marbled and streaked 

 with black lines as in the human. There is seldom an oppor- 

 tunity of inspecting horses which die from their natural age, 

 viz. of thirty to forty years : for I am informed they mostly die 

 or are killed in London before they are fifteen or sixteen years 

 old. I have not seen coaly matter in the lungs, or glands of 

 the ox kind, sheep, and hogs. The black appearances produced 

 by distended blood-vessels and by ecchymosis, should be re- 

 collected, to avoid the error of ascribing them to charcoal. 

 The absence of this matter in human creatures, at the ages 

 just mentioned, when animals are slaughtered or die, affords 

 a proof, although not a decisive one, that the exemption is 

 more reasonably ascribable to the circumstance of time, and 

 living in the open air, than to the peculiarity of the economy 

 of each species of live being. Consistently with this ob- 

 servation, in the instance of a cat, known to have lived in 



