180 



EXPERIMENTAL PHARMACOLOGY 



urination and proceed with the remaining observations. 

 To determine marked changes in the rate of oxygen con- 

 sumption by the animal an apparatus similar to that shown 

 in Fig. 172 is required. (See also Fig. 175.) This con- 

 sists essentially of the anesthetic apparatus shown in Fig. 

 116 but with the addition of a four or six inch thin alumi- 

 num (or pasteboard) disc which rests (stuck on with nraci- 



Olfactory lobe 



Crucial fissure 



Lateral sulcus 



Suprasylvian 

 sulcus 



Great 



longitudinal 

 fissure 



Lateral lobe of 



cerebellum 



Posterior pyramids 

 Cray matter of cord 



Oyrus Marginal is 

 Oyrus Suprasylvius 

 Oyrus Ectosylvius 



Vermis of cerebellum 



Ned u I Id oblongata 

 1st. cervical nerve 

 Spinal cord 

 White matter of cord 



Fig. 171. Dorsal surface of the brain of a cat. (Partially adapted from Daviscn.) 



lage) on top of the bath cap covering the large pan in the 

 bottom of which is placed strong (not saturated) sodium 

 hydrate solution [Ca(OH) 2 may also be added if desired] 

 to the depth of about three-fourths or one inch. Oxygen is 

 run into the breathing pan from the tank as needed. In 

 the center of the aluminum disc are two small holes in 

 which is tied a twine string about four feet long. One, two 

 or three bull-dog forceps must usually be laid on the top of 

 the disc to cause it to move down readily as the dog in- 

 spires. As the dog expires the disc moves upward. These 



