410 ADVANCED PHYSIOLOGY 



Page 156. The conditions described here can be imitated by using the 

 same apparatus as above, connecting a U-tube on the side branch, and 

 filling it half full of mercury. The open end of the U-tube should be long 

 enough so that subsequent rise of the mercury during the pressure on the 

 syringe bulb will not throw the mercury out. All air must be taken out 

 of the tubes between the water and mercury, as such an air cushion will 

 practically counteract the effect of rhythmical pressure on the water. 

 The capillary end must be used on the horizontal tube in this experiment. 



Page 157. Connect a syringe bulb with a Y-tube, and to the branches 

 of the Y connect a glass and a rubber tube respectively ; these should be 

 of equal caliber and about four feet long; the rubber tubing should be 

 thin and elastic. A removable glass capillary should be fitted to the 

 free end of each tube. By having a clamp, or valve, in each tube near 

 the arms of the Y, water can be sent through either tube separately. A 

 continuous stream can be obtained when the bulb is pressed rhythmically, 

 only when water is running through the rubber tube and then only when 

 the capillary is attached to it. See figure below. 



Rubber 



Glass 



Page 170. It will add to the interest of the class to show them thyroid 

 tablets, adrenalin tablets, and powdered pancreatin such as is used medici- 

 nally and obtainable at any drug store, or from physicians. 



Page 172. The ready combination of oxygen with carbon in wood is 

 strikingly shown by making oxygen and thrusting into it a glowing splinter. 

 Fine wire taken from a piece of picture cord, loaded with a bit of flaming 

 sulfur, will burn if plunged into a jar of oxygen. 



CHAPTER XII 



Page 178. If a large class is being taught, the trachea and lungs of a 

 sheep or calf should be used to show the structure of those organs. In 

 the case of a small class it is better to show these organs in position in a 

 cat ; the glottis, epiglottis and voice-box, as well as the arrangement of 

 the lungs in the thoracic cavity, can be shown in such a small animal to 

 advantage. The lungs should be inflated by inserting a tube into the 

 trachea and blowing them full of air. The bronchi and bronchioles can be 



