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Thaddeus L. Bolton and Eleonora T. Miller 



Table I contains all records taken from January 27 to April 

 17. During this time the method of experiment remained con- 

 stant with the exception of the number of records daily. Part 

 of the time two records a day were taken and part of the time 

 only one. 



The actual amount of practice gained is shown in a comparison 

 of the averages of all records of the first and last periods for 

 both B. and M. 



The right hand shows a greater gain for M. and the left for B. 

 On account of injury to the right hand, B. suspended work from 

 February 26 to March 18; previous to actual suspension the 

 records had been invalidated by a broken mask. While the right 

 hand had up to that time given generally as good or better rec- 

 ords than the left, it never afterwards reached the height of the 

 left except on one occasion. 



The experiment began with the thought of working three times 

 a day. On the first day two records were taken and three on 

 the second. This proved a very severe regimen. The muscle 

 soreness and the general physical condition which resulted were 

 such as to convince us that such a task was too great to yield 

 the best results, and accordingly two records a day were after- 

 wards taken. The weight used was unusually heavy and that 

 in a measure was the cause for such a result. Lack of inurement 

 is the chief factor to be noted in these first records, and with so 

 heavy a weight inurement comes slowly. In the first period the 

 average performance increase in six days for the left hand of M. 

 was 15.4 mm. and for the right hand of B. was 1.1 ; for the right 

 hand of M. and the left hand of B. a loss of work was shown. 

 The amount of exercise required to habituate one to an instru- 



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