Warminct Up. 25 



Que fact came out here in conflict with the teaching of 

 physiology in some colleges. The rate of fatigue was just 

 the same, with the circulation entirely shut off, as it was 

 before. Other experiments were made in this line but noth- 

 ing valuable resulted. 



The next experiment seemed to be more decisive. Sub- 

 ject G. had been a subject for an hour or more in another 

 room learning nonsense syllables, where he had shown a dis- 

 tinct warming up toward the end of the hour. His curve 

 was taken very soon after learning syllables and it was found 

 to be his warmed up curve, though he had been quiet physi- 

 cally all the afternoon. The curve showed no flagging at all. 

 It was continued with no fatigue except the characteristic 

 rise and fall of a few centimeters seen on all of his warmed 

 up curves. This clue was followed. The subject was set to 

 adding for twenty minutes, at his most intense mental efl'ort 

 and immediately afterward his curve was taken. It resulted 

 always the same way. The warming up was apparent and 

 his characteristic curve was registered. Learning of syllables 

 was tried again and proved to give a somewhat more com- 

 plete warming up than the adding. See Plate 4, curve No. 45 

 for adding effect and No. 50 for memorizing effect. 



In later tests a record was also taken of the respiration 

 and pulse. It was found in every case that the respiration 

 did not change much in rate and the changes in height are 

 due somewhat to motions of the body other than respiratory. 

 The pulse regularly falls from 4 to G beats a minute in 

 this experiment. It would seem thus that increased respira- 

 tion or pulse has no share in the phenomenon of warming up. 

 It has been noticeable, too, in other experiments con- 

 ducted in this laboratory where the subject was adding for 

 forty minutes or learning syllables, or alternately learning 

 and adding, that the pulse falls though there is a gain in the 

 time required to add or learn the syllables. 

 This experiment shows the following: 

 1. Warming up is general but not universal. One subject 

 always did his best work first. He shows no warming up in 

 mental work either. He can do his best studying the first 

 half hour and regularly decreases. 



