﻿ORGANIC MATTER IN AIR. 



23 



TABLE XI. 



No. of ex- 

 periment. 





Amount of 



Time 



Date, 1895. 



air 



taken in 





aspirated. 



aspirating. 



29-IV 



82.0 L. 



21i hrs. 



30-IV 



191.8 " 



48 " 



1-V 



212.25 " 



22 '' 



2-V 



238.0 " 



21f " 



2-V 



235.7 '' 



23^ " 



3-V 



183.0 " 



21^ " 



3-V 



123.0 " 



21^ " 



4-V 



128.765 " 



69f " 



Source of the 



Mgs. of HaS in 



air. 



1 cbm. of air. 



Sewer pipe 



76.70 mgs. 



a 



24.81 " 



a 



30.43 *' 



Room 



26.84 " 



Sewer pipe 



29.21 " 



Eoom 



30.65 " 



Sewer pipe 



33.88 " 



a 



64.69 '' 



Mgs. of SOa in 

 1 cbm. of air. 



144.39 mgs. 



46.71 



57.29 



50.52 



54.98 



57.70 



63.79 

 121.78 



This table shows analyses made to determine the quantities of other 

 reducing bodies in the air besides those of organic nature. The re- 

 sults obtained are expressed as sulphuretted hydrogen in the one 

 column, and as sulphurous acid in the other. Both of these react on 

 the iodine in a similar manner, and it is impossible to separate them 

 from each other in these analyses. The value of these results lies in 

 the fact that they show the extent to which the results obtained as 

 organic oxidizable matter with some of the methods are influenced by 

 these reducing bodies when present in the air. 



SIMULTANEOUS DETERMINATIONS. 



In order to ascertain the relative value of the results obtained by the 

 different methods, it was deemed advisable to make simultaneous 

 determinations on the same air with several of the methods. Such a 

 series of determinations should afford some indication as to which of 

 the methods is probably the most reliable from the uniformity of the 

 results which they give us. 



TABLE XII. 















Mgs, of consumed from 1 cbm. of 



No. of 



Date, 



1895. 



Method. 



Amount o 

 air used 



f Time 

 ^ taken in 

 aspirating. 



Source of 

 the air. 



air. 





ment. 





















form. 



Dust-form. 



Total. 















mgs. 



mgs. 



mgs. 



1 



10-X 



Ill-b 



136.5 I 



.. 3f hrs. 



Room 







0.22916 



2 



10-X 



Il-a 



8.0 ' 



' 31 " 







5.98728 



14.66275 



20.65403 



3 



10-X 



I-b 



8.0 ' 



' 2} " 











14.66275 



4 



11-X 



Ill-b 



172.75 ' 



' 5 - 











0.63048 



5 



11-X 



Il-a 



6.33 ' 



' 5i " 







3.12827 



15.64137 



18.76964 



6 



11-X 



I-b 



8.0 ' 



' 4 " 











15.71782 



7 



12-X 



Ill-b 



20.0 ' 



' 3;v " 











10.09085 



8 



12-X 



Il-a 



7.625 ' 



' 3f " 







11.58682 



17.57121 



29.15803 



9 



12-X 



I-b 



7.5 ' 













8.67313 



10 



14-X 



Ill-b 



95.0 ' 



' 4i " 











0.87462 



11 



14-X 



Il-a 



7.25 ' 



' 5tV " 







7.01115 



21.30313 



28.31428 



12 



10-X 



I-b 



7.5 ' 



' ^\ " 



<< 







14.72792 



