Some Aspects of Town Air. iy 



constituents of town air and their further examination is 

 worthy of more attention than has hitherto been given to it. 

 And considering the importance of pure air, it would be 

 well if such analyses of air were frequently and systemati- 

 cally carried out by sanitary boards as a matter of routine 

 under some such scheme as the following : — 



A ir of dwellings in special cases ; 



The estimation of carbonic acid gas, of organic matter 

 and micro-organisms. 



Air of streets ; 



The estimation of sulphur compounds, of suspended 

 organic matter, micro-organisms, and noxious gases. 



