38 Gas Analysis. IV 
solution in the acidulated water is very close to 1 per cent; that 
is, analyses of air giving 5.50 per cent should be corrected to 5.55 
per cent, or 2.10 to 2.12. 
The following names may be used for the apparatus* described 
in this series of papers: (1) For that described in the first paper, 
analyzer for CQ in alveolar air and blood; (2) for that shown in 
Fig. 1 of this paper, respiratory gas analyzer; (8) for that in Fig. 
3, atmospheric CO: analyzer; (4) for that shown in Fig. 4, modi- 
fied Orsat analyzer. 
I am indebted to Professor A. L. Prince and Mr. A. H. Smith 
for valuable assistance in the development of this apparatus. 
4 These instruments may be obtained from the Emil Greiner Company, 
55 Fulton St., New York. ; 
