26 



Scientific Proceedings (36). 



This correspondence seems to be a strong proof that the casein of 

 the milk is formed by a breaking down of the nucleoprotein of the 

 cell protoplasm with a setting free of the carbohydrate and the 

 purine and pyrimidine bases. 



16 (426) 



Respiration by continuous intra-tracheal insufflation of air. 

 A demonstration. 



By S. J. MELTZER and J. AUER. 



At the April meeting of this year, we reported that by means of 

 continuous intra-tracheal insufflation of air, we succeeded in keep- 

 ing up the life of curarized animals. We do not intend to discuss 

 now this subject theoretically, but wish to demonstrate this method 

 in its simplified form. 



A stomach tube, having only one opening at its lower end, is 

 introduced, through mouth and larynx, in the upper end of the 

 right bronchus. The outside end of the tube is connected by 

 means of a T-tube with a manometer and a bottle containing 

 ether. This bottle is connected with glass blowers bellows, which 

 are so handled that the pressure is kept up at about 15 millimeters 

 of mercury. The dog has been operated nearly two hours before 

 and the thorax has been opened transversely, so that lung and 

 heart are freely exposed. The lungs are continuously moderately 

 distended and quiet and the heart beats strongly and regularly. 



The principle of this method differs from that of Brauer (and 

 others) that the greatest part of the " dead space " of the respira- 

 tory path is eliminated, that the pressure is not static but dynamic, 

 the air being continuously driven in by this pressure, and that the 

 carbon dioxide is continuously driven out from the trachea by the 

 same pressure, instead, as in the Brauer method, of escaping 

 against a higher pressure. 



A good many dogs were operated by this method ; none had 

 bronchitis or pneumonia. Under aseptic precautions, many sur- 

 vived various profound surgical procedures (in the hands of Dr. 

 Carrel and Dr. Elsberg). We may add that no animal died from 

 ether, even when used very freely, and that no vomiting occurred. 



