38 Thaddeus L. Bolton and Eleonora T. Miller 



These figures show that in the first half of the experiment the 

 morning records have averaged uniformly higher than the after- 

 noon records, and that in the second half of the experiment the 

 afternoon records have averaged uniformly higher than the morn- 

 ing records. 



We find in this a further confirmation of the suggestion made 

 above that until inurement is perfect exercise induces a condition 

 within the muscles themselves which reduces their capacity for 

 work. In the first observations the morning record produces a 

 condition of local fatigue which influences deleteriously the after- 

 noon record. By the following morning this condition is re- 

 lieved, or if not completely so, the reagents are better able 

 to work than they are in the afternoon. After inurement 

 has become perfect, as it seems to have been in the latter part of 

 the experiment, the morning practice actually influences favor- 

 ably the afternoon practice. The morning record does this per- 

 haps by creating a favorable disposition toward the experiment, 

 a disposition to excel or rival oneself; and, again, a certain 

 amount of preliminary exercise, which is in the nature of a warm- 

 ing-up process, produces a condition of motor excitement which 

 is favorable to the attainment of the maximum. It should be 

 observed, further, as practice goes on recovery is more speedy, 

 so that while the effects of the morning exercise in the earlier 

 part of the experiment are still manifest in the afternoon, in the 

 latter part of the experiment the recovery is not only complete, 

 but the organism has actually built itself up as a result of the 

 practice in the morning, and yet it is not quite clear how a thor- 

 oughly inured reagent could benefit from morning practice by 

 afternoon. The process of building up of cells has been thought 

 to go on more slowly and to require the longer periods of sleep 

 to accomplish itself. 



We have in this, then, a further demonstration of the fact that 

 the lack of inurement is in part responsible for the great gain 

 that has been made during the first two rest periods, and that it 

 is not the lack of inurement which is accountable for the gains 

 made during the last rest period. No muscle soreness of impor- 

 tance manifested itself, and the fact that afternoon records have 



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