1915] SPOEHR—RESPIRATORY ACTIVITY 383 
the periods between 9 p.m. and 6 a.m. It is impossible to derive 
an accurate ratio from so short an experiment. An 
y rate 
night rate 
arrangement for automatically taking out the used and putting 
TABLE Ix 
No. . Time Hours Air perhour |mg. CO: per hour Weather 
I | 8:00 P.M.6:00 A.M. 10.00 4.00 3-36 A 
2 | 6:00 A.M.-8:00 P.M. 14.00 3-70 3-59 A 
3 | 8:00 P.M.—6:00 A.M. 10.00 5-10 3-59 A 
4 9:15 A.M.-8:00 P.M 10.75 ovae 4.18 A 
5 | 8:00 P.M.-6:00 A.M. 10.00 3-30 4.18 A 
6 | 6:00 A.M.-8:00 P.M. 14.00 2.85 4.47 B 
2a senee 
ssuditiinnsattt 
in the new Meyer’s tubes will materially reduce the personal labor 
involved in the observations. The striking feature of the curve 
is the great irregularity of the single observations. Obviously it 
will be necessary to make measurements of the atmospheric con- 
ductivity simultaneously with those of carbon dioxide evolution 
in order to gain more light on these observations. 
