

1905.| Determination of Atmospheric Carbon Dioxide. 117 
In Table III we have taken the results obtained with the surface-absorp- 
tion method as given in Table I, in which very variable amounts of carbon 
dioxide were present in the air-stream, and have calculated the amount 
A 
00356 + 2° x 000118. 
Alongside these results we have given the amount of carbon dioxide found 
by an independent determination with the Reiset’s apparatus. 
present in volumes per 10,000 by means of the formula 
Table IIJ.—CO, in Parts per 10,000 of Dry Air. 








By surface absorption with NaHO | 
No.of _ By Reiset’s solution. Ditoeuice | 
experiment. | apparatus. A | 
0:0356 +f x 000118 ° 
1 0°04 0:04 0-00 
2 0-19 0-19 0-00 
3 0-56 0°57 +0:01 
f 1°08 1-08 0:00 
5) 115 Toa + 0-06 
6 3°21 3°30 +0:09 
7 3°36 3°30 — 0°06 
8 4°58 4°4] —0°17 
9 4°89 4°93 + 0°04 
10 6°75 6°72 — 0°03 
11 €°65 7°50 —0°15 
12 8°54 8°23 —0°3l1 
ipa |e 12-53 12°40 = (ie) 
14 eli Od 17°74 — 0°20 



A further comparative test of the two methods was made with ordinary air, and 
gave the following results :— 
Table I1V.—CO, in Parts per 10,000 of Dry Air. 


By surface absorption with | 
No. of Tempera- | By Reiset’s NaHO. Difference 
experiment.| —_rure. apparatus. A 
0°0356 +7 x 000118 








1 15°:3 3°29 3°29 0°00 
9 15°°7 3°33 3°32 — 0°01 
3 21°°8 3°05 3°10 +0°05 
4 93°-7 3°15 3°16 +0°01 
Jodrell Laboratory, 
Royal Gardens, Kew. 
