134 Scientific Proceedings, Royal Dublin Society. 
Series 6.—(ArtiriciaL Mixturss). 
Paraffined Winchester Quarts containing purified air and known volumes 
of carbonic anhydride. All operations as in Series 5, but with the 
greatest possible care. 
Barometer= 759mm. T.=21°C. 1c.c. CO, added = 0:927 c.c. at N.T. P. 
Parts of | Parts of 
No. of | BRaryta Neal Carbonic Capacity CO; CO, Error in 
Experi-| solution @ d anhydride of addedin | foundin | parts per 
ment. added. se ee found. receiver. 10,000 10,000 10,000. 
of air. of air. 
sete Sa Es J eu i 3 
1 | 50 c.c. | 40°80 c.c.| 0°920c¢.c.| 2589 ¢.c. | 3°58 3°55 — 0:03 
yl aoe) 4, OOO 5, | OHO 4 | Sas | ee || = woe 
3 Sikes ZOO) 55 | OWlO 55 WE 55 | Bouy 3°48 — 0:06 
£ 55) 38 AOS OMe ORI ZO 2942 ,, 3°15 3°12 — 0:03 
5) 56° “Op 40°80 ,, | 0:920 ,, 3010 ,, | 3:08 3°05 — 0:03 
6 ee Spoilt: — 2656 ,, — — — 
The results of this last series may be summoned up as 
follows :— 
Carbonic anhydride taken, . : : : : 4 = O827 Ge, 
> 99 found (mean), 0 : 5 = W@ilO .. 
Error (mean), . : : i : - — 0-011 ,, 
Mean error in parts per 10,000 of air taken, . 9 = 0.04 
Greatest ,, i es fi ; 0 SOO 5 
Least, a 59 90 : —0:02 ,, 
In the following series of determinations of carbonic anhydride 
in air, paraffined receivers were also employed with the same 
titrating vessels, burettes, etc., as were employed in the expe- 
riments with artificial mixtures. 
The first of this series (No. 7) was made merely for the purpose 
of comparing the differences in the amount of carbonic anhydride 
found in parts per 10,000 of air under the same conditions of ex- 
periment, and no corrections for temperature and pressure were 
made. In the series which follow, these corrections were made, 
and the proportion of carbonic anhydride in air at N.T. P. are 
given. 
