620 Experiments 



Experiment CLXXXV. August 7. Female dog weighing 8.5 kilos. 



Drew at normal pressure 31.9 cc. of blood; the animal loses also, 

 by accident, about 35 cc A 



5:25, 5 atmospheres; drew 30.7 cc. of blood, from which bubbles of 

 gas are discharged . . . . B 



6:05, 8 atmospheres; drew 31.9 cc. of blood; numerous bubbles . . C 



6:33, 10 atmospheres; drew 33.8 gm. of blood; gases were dis- 

 charged in abundance, and coagulation threatened to take place rap- 

 idly . . . . D 



Decompressed; the end of its story in Chapter VII. 

 Blood A (1 atm.) contains per 100 volumes: O 22.8; CCh 50.1; N 2.3 

 Blood B (5 atm.) contains per 100 volumes: O* 23.9; CO 35.2; N 6.0 

 Blood C (8 atm.) contains per 100 volumes: O 25.4; CO* 37.6; N 9.5 

 Blood D (10 atm.) contains per 100 volumes: Cb 25,2; CO 39.0; N 10.0 



Experiment CLXXXVI. August 8. Dog weighing 12.5 kilos. 



Drew 33.8 cc. of blood at normal pressure, from right carotid . . A 



Put into apparatus at 4:45. 



5:33, 5V 2 atmospheres; drew 32.9 cc. of blood; discharge of gas . . B 



6:41, 10 atmospheres; drew 36.1 gm. of blood; gas in abundance in 

 the syringe . . . . C 



Decompressed; the end of its story in Chapter VII. 

 Blood A (1 atm.) contains per 100 volumes: Ch 20.2; COa 37.1; N 1.8 

 Blood B (5V 2 atm.) contains per 100 volumes: O* 23.7; CO 35.5; N 6.7 

 Blood C (10 atm.) contains per 100 volumes: O2 24.7; CO 37.9; N 9.8 



These different results are arranged in Table XI, by increasing 

 order of pressures. 



If now we examine the figures it contains, which is easily done 

 by an inspection of Columns 12, 13, and 14, in which are indicated 

 the modifications in percentages of the volume of the gases ex- 

 tracted from the blood under pressure, we see at first glance: 1) 

 that the oxygen and nitrogen have always increased; 2) that the 

 carbonic acid has sometimes increased and sometimes diminished. 



This can be shown in clearer form by making the following 

 calculation on the different numbers. 



We shall assume that, at normal pressure, the blood always 

 contains 20 volumes of oxygen, 40 volumes of carbonic acid, and 

 2.2 volumes of nitrogen; the quantity contained at the other pres- 

 sures will be easily deduced from a proportion. 



And so, for the first experiment listed in the table, the propor- 

 tions will be at 2 atmospheres: 



CO 



N 



18.3 : 20 = 19.1 : x = 20.9 



37.1 : 40 = 37.7 : x = 40.7 



2.2 : 2.2 = 3.0 : x = 3.0 



