﻿35.— Atmospheric microbes. 



a, algae; h, cells of cryptogams; c, spores of cryptogams. X500. (Miquel. 



WOOD 



A\9 





36.— Atmospheric microbes. 



«?), vibrios; c f/, bacteria; /r/ /), micrococci; /, torulae. X1000. (Miquel.) 



The Air of Towns. 



