516 Dr. B. A. Smith on the Examination of Air, [Dec. 13, 



There is one very irregular result, probably some accident ; but I had 

 no proof of such, and it is therefore retained. 



Hydrochloric Acid (Chlorides) in the air. 



Devonshire Street, Manchester, 

 1876. 



By shaking. 



Aspiration, 3 bottles. 



Grammes 

 per million 

 cub. metres. 



Grains 

 per million 

 cub. feet. 



Grammes 

 per million 

 cub. metres. 



Grains 

 per million 

 cub. feet. 



„ 11, fine, frosty morning 



„ „ 13, raining ; sheltered 

 from rain 



779 



233 

 389 



389 

 273 



340 

 102 

 170 



170 

 119 



206 

 51 

 206 



309 

 103 



175 



90 

 22 

 90 



135 

 45 





412 



180 



76 



Gases purposely mixed with air. 





By shaking. 



Aspiration, 3 bottles. 



Grammes 

 per million 

 cub. metres. 



Grains 

 per million 

 cub. feet. 



Grammes 

 per million 

 cub. metres. 



Grains 

 per million 

 cub. feet. 





1866 

 776 

 1415 

 1012 



815 

 339 

 618 

 442 



1744 

 680 

 1031 

 1010 



762 

 297 

 450 

 441 



" Free Ammonia" in air. 





By shaking. 



Aspiration, 3 bottles. 



Grammes 

 per million 

 cub. metres. 



Grains 

 per million 

 cub. feet. 



Grammes 

 per million 

 cub. metres. 



Grains 

 per million 

 cub. feet. 



Manchester, Dec. 2, 1876. Dull, 



93 



41 



70 



30 



