﻿OEGANIC MATTER IN AIR. 



19 



the room-air was found to be constantly higher than that in the 

 external air. 



TABLE VI. 



No. of 



Date, 1895. 



Amt. of air 



Time taken 



Source 



Mgs. of con- 

 sumed for 



experiment. 





aspirated. 



in aspirating. 



of the air. 



1 cbm. of air. 



1 



15-III 



196.0 L. 



2 hours 



External 



0.0000 mgs. 



2 



20-III 



418.0 *' 



^ u 



<< 



0.1955 ' 





3 



21-III 



698.0 " 



7 " 



(( 



0.0413 ' 





4 



21-III 



1429.0 " 



^ " 



Sewer pipe 



0.0000 ' 





5 



22-III 



598.0 " 



6 " 



External 



0.0000 ' 





6 



22-III 



1174.5 " 



41. " 



Sewer pipe 



0.1252 ' 





7 



23-III 



1938.5 '' 



6^ " 



" 



0.1240 ' 





8 



23-III 



660.0 " 



6f " 



Room 



0.0000 ' 





9 



25-III 



1471.6 " 



5 " 



Sewer pipe 



0.0000 ' 





10 



25-111 



623.0 - 



5i " 



Room 



0.0077 ' 





11 



4-IV 



576.0 " 



4 '' 



External 



0.0000 ' 





12 



4-IV 



176.6 " 



4 - 



Sewer pipe 



1.3600 ' 





13 



5-IV 



888.0 " 



9 " 



External 



0.0054 ' 





14 



5-IV 



2547.0 " 



9 " 



Sewer pipe 



0.0000 ' 





This table shows analyses made on room-air, external air, and the air 

 of the soil pipe with the quantity of organic matter estimated from its 

 action in reducing permanganate. The results obtained show no 

 uniform relations in analyses of air from the same source on succeeding 

 days. In a number of the determinations there was entire absence of 

 any reducing action, and since it is improbable that there is at any 

 time no organic matter in air drawn from such sources as these samples 

 were taken, it is evident that this is not a reliable method for the 

 determination of organic matter in air. 



Method IV. 



Absorbent material : a yVVir solution of permanganate of potash, as 

 employed by Carnelley and Mackie. 



Absorption apparatus : flasks of about four litres capacity. 



