﻿OEGANIC MATTER IN AIR. 



21 



TABLE YIII. 



No. of 

 experiment. 



Date, 1895. 



Amt. of air 

 used. 



Source of 

 the air. 



Windows. 



Atmospheric 

 conditions. 



Mgs. of con- 

 sumed for 1 

 cbm. of air. 



1 



2- VII 



3.968 L. 



Room. 



Open 



Clear 



12.096 mgs. 



2 



10-VII 



3.968 " 





a 









3 



26- VII 



3.968 '' 





" 







5.040 ' 





4 



26- VII 



3.910 " 





(( 







5.112 ' 





5 



16- VIII 



3.968 " 





(( 







6.048 ' 





6 



16- VIII 



3.910 " 





a 







6.112 ' 





7 



20- VIII 



3.968 " 





Closed 







4.032 ' 





8 



20- VIII 



3.910 " 





(( 







4.092 ' 





9 



26-VIII 



3.968 " 





Open 







3.025 * 





10 



26- VIII 



3.910 " 





(( 







3.069 ' 





11 



28- VIII 



3.968 " 





a 



Partly Cloudy 



2.016 ' 





12 



28- VIII 



3.910 " 





a 



a a 



2.046 ' 





13 



30- VIII 



3.968 '' 





i( 



Cloudy 



3.025 ' 





14 



30- VIII 



3.910 " 





i( 



" 



3.069 ' 





15 



2-IX 



3.968 " 





a 



Clear 



4.032 ' 





16 



2-IX 



3.910 " 





li 



u 



4.092 ' 





This table shows analyses made in which the organic matter is 

 determined from the quantity of ^-g^-g- permanganate solution that is 

 decolorized when shaken with a sample of air in a flask. The results 

 obtained with this method are only an approximate indication of the 

 amount of organic matter in a sample of air. It is open to the same 

 criticisms as the method of Carnelley and Mackie, and appears to give 

 results that are equally as good as those obtained by their method. 

 The points in its favor are the same as those claimed for their method, 

 while it is probably easier to operate and requires less apparatus. 



Method Y. 



Absorbent materials : (a) -^ sulphuric acid ; (b) twice distilled water. 

 Absorption apparatus : a Pettenkofer absorption tube. 



TABLE IX. 



No. of 

 experiment. 



Date, 1895. 



13-V 

 13-V 

 15-V 

 15-V 



17-V 

 17-V 



Amt. of air 



Time taken in 



aspirated. 



aspirating. 



342.0 L. 



26^ hours. 



55.0 '' 



264- " 



191.0 " 



26 



44.0 " 



461 " 



232.0 " 



25 - 



67.9 " 



25 " 



Source 

 of the air. 



Room 

 Sewer pipe 



Room 

 Sewer pipe 



Room 

 Sewer pipe 



Mgs. of NHg 

 in 1 cbm. of air. 



0.000 mgs. 

 37.090 



0.000 

 30.909 



0.000 

 25.029 



This table shows analyses made of room- air and the air of a soil pipe 

 in which the quantity of ammonia was determined directly. The air 

 was aspirated through j-^ sulphuric acid and the amount of free acid 



