i66 Dr. Pearson on the colouring Matter 



lungs in infants, in children, and even frequently in persons of 

 eighteen or twenty years of age. For the same reason these 

 appearances are seldom observed in any brute animal which 

 has fallen under my observation. On a subject so novel, or 

 at least so much neglected, as that on which I am writing, 

 many facts are wanting to establish, demonstratively, any 

 theory which can be proposed ; but I know of none, at this 

 time, which are at variance with that I have ventured to 

 offer. 



George-street, Hanover- square, June 13, 1815. 



P. S. Since my last communication to the Society, I have 

 had an opportunity of making some further observations and 

 experiments on this subject. 



The lungs of an infant, who lived two days, were obligingly 

 sent to me by my friend Mr. C. M. Clarke. I found the 

 bronchial glands quite white, and the lungs appeared exter- 

 nally of an uniform reddish colour. The pulmonary organs 

 of a girl of fifteen years old, I found rather thickly mottled, 

 but the bronchial glands were only tinged on their surface, 

 and did not yield one-fourth of a grain of coaly powder. In 

 two other females also, aged nearly fifteen years, who died 

 of pulmonary consumption, the lungs were not at all marbled, 

 but some of the bronchial glands were tinged black, and 

 others were white. The lungs of two men, the victims of 

 pulmonary phthisis, at the age of twenty-one years, exhibited 

 thinly, black spots, streaks, and areolae, with many of the glands 

 in question of a deep blue colour. A woman's lungs, thirty- 

 one years of age, were found studded beautifully with black 

 spots, and lines; the bronchial glands being all either blackish 



