RESEARCHES BY OTHER INVESTIGATORS. 



11 



carried out for which preparations had been made during the previous 

 winter. The report includes the gaseous exchange of the four authors 

 and two others during grade walking in treadmill experiments in 

 Berlin, and also on the railroad up the Rothorn, at Brienz, on Col 

 d'Olen, and for a few experiments at the Gnifetti-Hiitte on Monte 

 Rosa. Table 1 gives the computed percentages of efficiency for walk- 

 ing on the different grades in these experiments. 



TABLE 1. Percentage of efficiency in grade-walking, experiments made by Zuntz and Durig, 



and their colleagues. 



Durig, 2 in the report of his expedition to Monte Rosa, presents a 

 critical view of the preceding studies and also gives the results obtained 

 by himself and his companions, Kolmer, Rainer, and Reichel, at 

 Vienna and on Monte Rosa. The computed percentages of efficiency 

 for these experiments are also included in table 1. Like the preceding 

 work of Durig, these studies were carried out by the Zuntz method, 

 with all of the Durig refinements. Durig notes, in comparing the 

 experiments with himself on the treadmill and while walking on the 

 Neuwaldegg outside of Vienna, that the walking on the treadmill was 

 apparently done with less expenditure of energy than walking in the 

 open. He also finds that, within the speeds walked, the rate of walking 

 had but slight effect on the metabolism per kilogrammeter. He was 



1 Grade on treadmill: Kolmer, 18.2 p. ct.; Miiller, 2d period, 26.2 p. ct.; Durig, 2d period. 14.7 

 p. ct. ; Zuntz, on Monte Rosa, grade, 28.8 p. ct. 



'Durig, Denkschr. d. math.-natur. Klasse d. kaiserl. Akad. d. Wissensch., 1909, 86, p. 294. 



