-T^ 



y H 



E S SAYS 



FLOATING-MATTER OF THE AIR 



IN RELATION TO 



PUTREFACTION AND INFECTION. 



BY 



JOHN TYNDALL, F.E.S. 



(m. d. Tubingen). 



NEW YORK: 

 D. APPLETON AND COMPANY, 



1, 8, AND 5 BOND STREET 



1888. 



