NITROUS OXIDE ANESTHESIA 



115 



day. Turn on the N 2 and fill the bottle at once with this 

 gas (washing most of the air out of the bottle with the 

 N 2 0). How long does it take to anesthetize the frog? When 



Fig. 110. Method for making, purifying and administering nitrous oxide to a frog. 

 Strong solutions of ferrous sulphate, sodium hydrate and concentrated sulphuric acid 

 are placed in the wash bottles. 



Fig. 111. Yoke for tanks of oxygen, nitrous oxide or carbon dioxide. These yokes 

 are attached to the tanks and a rubber tube is slipped over the nozzle of the yoke. 

 When the valve of the tank is opened a little the oxygen passes out through the tube. 

 The yokes can be obtained of dealers in surgical supplies or from the Lennox Chemical 

 Company, Cleveland, Ohio (Price $ .75). 



the animal is deeply anesthetized remove it quickly from 

 the bottle and see how long it takes for complete recovery. 



