1889.] into the Phenomena of Human Respiration. 341 



experiments were repeated. The temperature, though varying to 

 a slight extent at different altitudes on the Peak, was always 

 high in the daytime ; hence there was no cause for any increased 

 formation of carbonic acid in the body towards the resistance 

 of cold. The result was most striking. While in the cold Swiss 

 Alps I had observed an increased expiration of carbonic acid in 

 ascending, on the Peak of Teneriffe there was no such effect produced. 

 The mean weight of carbonic acid expired at the three stations, by 

 two persons, was, with one exception only, applying to a Chamonix 

 guide, the same for each of them respectively. But the volumes of 

 air breathed at increasing altitudes were lessened,* so that the law 

 remained unchanged — that at increasing altitudes, less air, reduced 

 to 0° C. and 760 mm., is required to produce 1 gram of carbonic acid 

 in the body. The experiments on the Peak of Teneriffe, by doing 

 away entirely with the influence of cold, place the fact beyond doubt. 



As it is important towards a clear understanding of the results 

 contained in this paper that those obtained formerly should be present 

 to the reader, I beg to subjoin them in a tabular form. 



Experiments on the Alps. 

 (On myself.) 



Station. Altitude. 



JSear Geneva 375 m. (1,230 ft.) 



St, Bernard 2473 „ (8,115 „) 



Eiffel 2568 „ (8,428 „ ) 



St, Theodule 3322 „ (10,899 „ ) 



Summit of Breithorn 4171 „ (13,685 „) 



Litres of air expired 

 for 1 gram C0 2 , 

 reduced to 0° and 

 7 60 mm. 



.... 13-6 



Mean at and 

 above 8,115 ft. 

 up to 13,685 ft. 

 11-05 



On the Peak of Teneriffe. 

 (On myself.) 



Seaside 12'4 



Guajara 2161m. (7,090 ft.;.... 11'9 



AltaVista 3261 „ (10,700 „).... 107 



Foot of terminal cone 3578 „ (11,740 „ ) 10'6 



On the Col du Geant. 

 (On myself.) 



Near Geneva 375 m. (1,230 ft.) .... 15-5 



* An exception again for the Chamonix guide at his highest station, although 

 the mean reduced yolume of air he expired at the two high stations on the Peak is 

 lower than that he expired at the seaside by 18 per cent. 



