6 



Mr. J. Thompson. Action of 



[Aug. 27, 



III. Determination of the Respiratory Coefficient. 



The following tables show the results obtained with the apparatus 

 previously described. In each case 10 c.c. of medium were employed. For 

 Experiment 1 the figures are given in full, in order to show the course of 

 the experiment ; in the following experiments only the initial and final 

 readings are given, though it is to be noted that they were similarly 

 conducted. The day-by-day readings are essential, as the observation of 

 any marked irregularity in the consumption of oxygen would point to some 

 leak in the apparatus. The experiments were continued until the readings 

 after an interval of 24 hours were the same. 



Experiment 1. — Peptone Water. 





Internal capacity 

 of apparatus. 



Burette 

 reading. 



Temperature. 



Barometer 

 reading. 



Volume of gas, 

 corrected for 

 N.T.P. 





c.c. 



c.c. 



°C. 



mm. 



c.c. 





176 -8 



87 -0 



38 -2 



761 -6 



216 -7 



„ 8 ... 





87 -2 



37 -8 



759-1 



216 -7 



9 





85 -8 



38 -0 



758 -3 



215 -0 



11 





80 "2 



36 -8 



762 -4 



213-4 



„ 12 





76 -0 



34 -6 



757 -3 



211 -5 



„ 13 





76 -4 



36 -2 



756 -1 



209 -3 



„ 14 





74 -3 



35 -2 



753 -0 



208 -0 



» 15 





71 "2 



35-6 



755 -7 



205 -7 



„ 18 





64 -8 



37 -0 



774 -3 



203 -7 



„ 19 





65 -8 



37 -4 



771 -0 



203 -0 



Oxygen absorbed 2167 -203-0 = 137 c.c. 



C0 2 produced 10'35 c.c. 



Eespiratory coefficient ... ^rJyr = 0*76. 



No. 

 of experi- 

 ment. 



Substance. 



Corrected volume of gas. 

 Initial. Final. 



Oxygen 

 absorbed. 



co 2 



produced. 



Eespiratory 

 coefficient, 



co 2 /o 2 . 







c.c. 



c.c. 



c.c. 



c.c. 





2 



Peptone . . . 



214 -1 



207 -3 



6-8 



6-5 



0-96 



3 



Malic acid 



219 -6 



209-1 



10 -5 



17 -9 



1 -7 



4 





221 -7 



211 -3 



10 -4 



17 -9 



1-7 



5 





216 -1 



204-0 



12 -1 



20 -2 



1 -67 



6 





221 -2 



210 -2 



11 -o 



18 -4 



1 -67 



7 





216 -3 



204 -9 



11 -4 



15-7 



1 -4 



8 





214 -0 



209-9 



4-1 



6-7 



1-64 



9 



Citric acid... 



220 -3 



214 -6 



5-7 



13 -4 



2-35 



10 



1 





206 -4 



196 -6 



9-8 



31 -3 



3-2 



