On the Distribution of Micro-organisms in 



Air. 279 



. g O a O p3 



i 



H !H J) 



- 2 1 



"2 ^ "S 



o S ► 



8 -a S ° 



O M 



I I 



rH o 



a a 



1-1 o 



.a a 



11 



« .a 



£-3 • 



S= C £ 



! 'rS 

 £ © o 



QQ -S3 . 



^5 



CM 3 

 iH O 



-a a 



I a 



°o 



•i—s 



IS 03 



