On the different Forms of Breathing. 



C0 2 expired ; at the same time the percentage of C0 2 in that air was 

 somewhat greater than might have been anticipated. The present 

 arrangement made away with that slight defect. It should be under- 

 stood that the person under experiment while inspiring through the 

 nose, first expired through a tube into the open air, then by means of 

 three-way stop-cocks was placed in communication with either of the 

 three bell-jars, used in these experiments; thus, the bell-jar only 

 began ascending when the air was expired, while, during the period 

 of inspiration, the mouth-piece retained in the mouth entirely 

 checked any ascending tendency of the receiver. 



This last season (1893-94), both I and Mr. Moris submitted to 

 experiment for the determination of our carbonic acid expired and 

 oxygen absorbed (not given out as C0 2 ) in the state of repose. In 

 my case eleven experiments were made from 2 hours to 2J hours 

 after luncheon (chop, potatoes, and bread), while four others were 

 undertaken within 1 hour and 5 minutes after lunch. The results 

 are as follows : 



The Author, from 2 hours to 2 hours and 30 mins. after Luncheon. 



Per minute. 



The four experiments made within 1 hour and 5 minutes after 

 luncheon are shown in the next table. 



From these two series of experiments it will be observed that less 

 C0 2 is expired during the first hour after a meal than from2 to 

 2^- hours, but there is considerably more oxygen absorbed within the 

 first hour than from 2 to 2^ hours after the ingestion of food, the pro- 

 portion of 54'4 c.c. to 37 c.c. is a clear indication that such is the case. 



