Gases of the Blood 613 



Then, taking it out as quickly as possible, I drew blood from its 

 left heart by means of a cannula. 



Here are two experiments carried out in this way. 



Experiment CLXXX. May 15. Dog weighing 5 k.; bell- jar of 31 

 liters. Left carotid exposed in advance. 



5:40, put under the bell-jar, and the decrease of pressure begun, 

 maintaining a current of air. 



5:47, pressure 45 cm.; was struggling, but now remains quiet. 



5:50, 45 cm.; 17 respirations, deep; remains motionless; trembles. 



5:53, 35 cm.; 17 respirations; motionless, head lowered; at 5:55, 12 

 respirations. 



5:58, pressure 25 cm.; at 6 o'clock, 22 respirations; motionless. 



6:05, 16 respirations; pressure brought to 15 cm., at 6:07, can no 

 longer remain half crouching, as it has done till now; lies down, its 

 nose resting on the floor to support its head; takes 28 enormous 

 respirations per minute. Pressure maintained at 15 cm. 



6:10, 39 respirations less ample. 



6:13, 35 cm.; at 6:15, 44 respirations; evacuation of fecal matter 

 without apparent effort; at 6:19, 40 respirations. 



6:20, I close the intake valve; the pressure drops at once to 7 cm. 

 The dog rises on all fours, stiffens violently, but with slow regularity, 

 ceases to breathe, and sinks down dead. 



I admit air: the animal's sides collapse. When taken out, it takes 

 two or three little inspirations while the cannula is being inserted into 

 the left heart. The heart is still beating a little; with much difficulty 

 32 cc. of very dark blood is drawn. 



The lungs are red in wide patches, sinking in water, but unfold- 

 ing completely with insufflation. They are in a sort of fetal state. No 

 blood in the trachea or in the bronchioles. 



The extracted blood contains per 100 volumes: CO 19.0; Oa 4.9. 



Experiment CLXXXI. May 23. Dog weighing 4 kilos. 



Took from the left carotid 33.3 cc. of blood. 



6 o'clock. Put under the 31 liter bell-jar; pressure decrease begun. 



6:06, pressure 40 cm.; at 6:08, 35 cm.; 14 respirations. 



6:12, brought up to 45 cm.; 10 respirations. 



6:15, pressure 31 cm.; rises, sits down, turns around. 



6:17, pressure 26 cm.; seated with its head lowered, 15 respirations; 

 raises its head when the bell- jar is struck. 



6:20, pressure 15 cm.; falls down, urinates, barks faintly and 

 plaintively. 



6:21, pressure 13 cm.; gets up, barks, and falls back. 



6:25, pressure 13 cm.; lying down, 9 respirations, medium. 



Cock closed; the pressure falls slowly to 7 cm.; the animal seems 

 dead, when suddenly (6:27) it stands upright, stiffens slowly and 

 strongly, and falls back. 



Pressure raised to 15 cm.; it seems better, moves a little; pressure 

 dropped to 7 cm.; dies without moving. 



Withdrawn immediately. I extract without difficulty from the left 

 heart 50 cc. of very dark blood . . . . B 



