Device for Regulating Administration of Ether. 159 



lungs. By means of this device an animal may be kept in any 

 desired state of anesthesia over a long period of time with little or 

 no attention. 



The apparatus consists of a three-necked Wolff-bottle or other 

 convenient container for the anesthetic, so fitted with tubes (metal 

 or glass) and stop-cocks that by turning slightly a single stop-cock 

 any portion or all or none of the stream of air for respiration may 

 be passed over the surface of the anesthetic, thus charging the air 

 with any desired quantity of the anesthetic. The relative quan- 

 tity of anesthetic in the inspired air may be read off on a convenient 

 scale. The apparatus is also fitted with a manometer, and an 

 escape stop-cock for regulating the pressure of the air entering 

 the lungs. The cock regulating the quantity of air passing into 

 the bottle is a three-way cock placed at the junction of a T-tube, 

 the vertical limb of which passes through the stopper of a side 

 neck of the bottle. The ports of the cock are so arranged that 

 the one admitting the air is always wide open, and the port leading 

 into the anesthetic container begins to open as the port leading 

 directly to the lungs begins to close. Thus any portion or all of 

 the air stream may be shunted into the anesthetic container, and 

 on issuing at the farther opening it rejoins, by means of a T-tube, 

 the stream passing directly to the lungs, charging it with the de- 

 sired quantity of anesthetic. The manometer is introduced into 

 the circuit on the side of the container nearest the lungs. It is 

 provided with a direct reading scale, visible from either side. The 

 stop-cock for regulating the pressure is placed on the side of the 

 container nearest the air pump. The third neck of the container 

 is fitted with a funnel tube for filling. It is also convenient to 

 have a side tubulure near the bottom of the container, by means 

 of which any water condensed in the container may be off. The 

 whole apparatus is mounted on a compact frame. 



Not only was the device found useful with artificial respiration, 

 but a preliminary trial seemed to indicate that it would also prove 

 serviceable in administering an anesthetic with voluntary respira- 

 tion either with or without tracheotomy. If it is desired to 

 administer the anesthetic without tracheotomy, it is only necessary 

 to introduce a tube (a stomach tube answers very well) into the 

 trachea and attach it to the bottle. The tube in this case should 



