﻿20 



METHODS FOE THE DETERMINATI0:N' OF 



TABLE VII. 



No. of 



Date, 1895. 



Amt. of 



Source 



Windows. 



Mgs. of con- 

 sumed for 



experiment. 





air used. 



of the air. 





1 cbm. of air. 



1 



9-V 



3.885 L. 



Room 



Open 



12.3552 mgs. 



2 



9-V 



3.910 " 







(( 



12.2762 ' 





3 



10-V 



3.885 " 







a 



12.3552 ' 





4 



10-V 



3.910 '' 







'< 



12.2762 ' 





5 



11-V 



3.885 " 







" 



10.3293 ' 





6 



11-V 



3.910 " 







(( 



10.2301 ' 





7 



11-Y 



3.885 " 







a 



12.3552 ' 





8 



11-V 



3.910 " 







a 



12.2762 ' 





9 



18-V 



3.885 " 







Closed 



28.8288 ' 





10 



13-V 



3.910 " 







" 



28.6444 ' 





11 



15- V 



3.885 " 







(( 



8.2368 ' 





12 



18-V 



3.885 " 







a 



10.3293 ' 





13 



18-V 



3.910 '' 







li 



6.9565 • 





14 



24-V 



3.885 '•- 







a 



12.3552 ' 





15 



24.V 



3.910 " 







i( 



12.2762 ' 





16 



27-V 



3.885 " 







(( 



8.2368 ' 





17 



27-V 



3.910 " 







i( 



8.1841 ' 





18 



29-V 



3.885 " 







Open 



8.2368 * 





19 



29-V 



3.910 '' 







a 



6.1381 ' 





20 



dl-V 



3.885 " 







" 



8.2368 ' 





21 



31-V 



3.910 " 





i 



(( 



8.1841 ' 





22 



1-VI 



3.885 " 







(( 



24.7104 ' 





23 



1-VI 



3.910 " 







a 



16.3682 ' 





24 



3.VI 



3.885 " 







a 



8.2368 ' 





25 



3-VI 



3.910 " 







li 



• 2.0460 * 





26 



4- VI 



3.885 " 







Closed 



16.4736 ' 





27 



4- VI 



3.910 '' 







" 



8.1841 ' 





This table shows analyses in which the organic matter is determined 

 colorimetricallj by comparing a portion of the permanganate that has 

 been exposed to the air with the tint of an equal amount of fresh per- 

 manganate solution. 



"While the results show marked variations in the amount of 

 organic matter in the air in a few of the determinations, the results 

 cannot be taken as showing with any degree of accuracy the amount 

 of organic matter that was really present. The objections to this 

 method have already been considered elsewhere at sufficient length to 

 require any further remarks. It is probably true, as claimed by 

 Carnelley and Mackie, that for a rough estimate this method is not 

 without some value. The principal points in its favor are the fact 

 that it is portable and may thus serve to analyze air at a distance from 

 the laboratory, and that it requires quite simple apparatus for its 

 operation. 



