212 KANSAS UNIVERSITY SCIENCE BULLETIN. 



"reasonable regularity" is meant the average normal condition 

 of the individual subjects. No restraint was put upon a sub- 

 ject who was in the habit of using tobacco or other stimulant, 

 other than to require that he should not alter his habit pre- 

 ceding a test. It was considered that a man who smokes 

 would be more normal if allowed to smoke as usual than he 

 would be if this were prohibited temporarily. The days for 

 the tests were chosen that were freest from fatiguing occu- 

 pations for each subject concerned. If for any cause a sub- 

 ject did not feel that he was normal on a certain day, the 

 test was deferred. While some tests were taken with some 

 subjects in the late afternoon, they were always preceded by 

 rest or a day of light work, which was fairly constant for the 

 different days. 



METHODS OF TABULATING RESULTS. 



Tables la, Ha and Ilia give the averages of results by 

 periods of five or of four minutes. It would be reasonable to 

 expect that where averages are given, some means of showing 

 how nearly the individual results conform to the average 

 would be given also. The inconsistency of stating an average 

 without stating the mean variation, at least, is recognized. 

 But, granting the inconsistency, it is believed that these tables 

 justify their presence in this discussion. The reasons for the 

 incompleteness of these tables are : First, neither averages 

 nor mean variations of the periods from day to day are very 

 important for our purpose. We are interested principally in 

 the differences between the forework period and the after- 

 work period of the same day. In the second place, these tables 

 are already large. The addition of mean variations for every 

 average would make them too confusing. A further discus- 

 sion of the results of these tables will be found in the discus- 

 sion of the curve of work (p. 236). Tables 16, 116 and III6 

 present the totals of results for each day, and the per cent 

 of increase or decrease in the second test when compared 

 with the first. If the effect of rest or physical fatigue is the 

 same each day, then these per cents would be the same. The 

 average and mean variation is therefore legitimate in this 

 case. 



In the association test it is necessary to compare the results 

 obtained on the various days. For this reason the conditions 

 on the various days was kept as nearly uniform as possible. 



