280 ADDITIONAL NOTES ON CONTAGION. 



but I do not think a contradiction to thi9 opinion; the materies morbi in these seems to 

 be of a grosser nature, not so readily assuming a very elastic aeriform state as that of the 

 diseases of the third class ; and hence the circle of contagion is much more restricted 

 near the bodies of the sick. 



Of the third class the fomes may certainly be, in some instances, in the first place 

 generated in the atmosphere, and for that reason requires particular circumstances of heat, 

 moisture, &c. but finding materials in the bodies of the sick to act upon, it readily assi- 

 milates a large portion to its own nature, which being very elastic and aeriform, spreads 

 to a wider extent, and contaminates the atmosphere, particularly a foul atmosphere, in 

 which similar ingredients are found to a great extent. 



Your's sincerely, 



Dr. Hosack. SAMUEL BARD. 



