Kreider — Oxygen in Air and in Aqueous Solution. 365 

 Relation of Arsenic to Oxygen. 



f„As,0.. 



Oxygen equivalent 

 at 0° and TeO'^'". 



Correction for 

 0-01 cmS^As^O 



37-0 



20-714 



0-005 



37-1 



20-770 





37-2 



20-826 





37-3 



20-882 





37-4 



20-938 





37-5 



20-994 





37-6 



21-050 





37-7 



21-106 





37-8 



21-162 





37-9 



21-218 





38-0 



21-274 





Table I shows the results obtained in a series of determina- 

 tions. Experiments 1 to 11 inclusive were made upon portions 

 of air collected over water on March 28, measured in an ordi- 

 nary gas burette and reduced to the standard conditions of tem- 

 perature and pressure. The remainder of the determinations 

 were made upon air collected on April 8th, each portion hav- 

 ing been measured in the apparatus described, for the reduction 

 to standard conditions. 







Table 



I. 







Yol. of Air reduced to 



^As,0, 



Yol. of Oxygen found 



Per cent oi 





0^ and 760'"". 



required. 



at 0° and 760"^"'. 



Oxygen in 





cm^. 



cm^. 



cm^. 



Air. 



1. 



91-18 



34-06 



19-07 



20-91 



2. 



91-73 



34-47 



19-30 



21-04 



3. 



90-84 



34-25 



19-17 



21-11 



4. 



90-60 



34-20 



19-16 



21-13 



5. 



86-06 



32-55 



18-22 



21-17 



6. 



85-96 



32-40 



18-14 



21-10 



7. 



86-49 



32-53 



18-21 



21-06 



8. 



87-85 



33-00 



18-47 



21-03 



9. 



44-17 



16-60 



9-29 



21-04 



10. 



44-11 



16-70 



9-35 



21-19 



11. 



44-54 



16-80 



9-41 



21-12 



12. 



100-00 



37-44 



20-96 



20-96 



13. 



100-00 



37-54 



21-01 



21-01 



14. 



100-00 



37-50 



20-99 



20 99 



15. 



100-00 



37-57 



21-03 



21-03 



16. 



100-00 



37-47 



20-97 



20-97 



17. 



100-00 



37-50 



20-99 



20-99 



