1891.] Formation of Carbonic Acid in Human Respiration. 69 



were produced on either of us. I submitted to three experiments and 

 Mr. Russell to two. 



These experiments (with one exception) were undertaken at the 

 same time as others made with fresh air, though about an hour later, 

 and references are entered in the following table in order that the 

 corresponding experiments may be compared with each other. 



Air Breathed containing an excess of Carbonic Acid. 

 Dr. Marcet under experiment. 



