EFFICIENCY AND FATIGUE 251 



twelve. This three-fold increase held almost equally 

 for eye accidents, burns, and sprains, as well as for 

 cuts. 



In addition to tabulating accident cases, I deter- 

 mined the frequency with which the workers were 

 treated at the dressing-station for faintness, and were 

 restored from their collapsed condition by the admini- 

 stration of sal-volatile. During the fatigue period 

 faintness cases were 9 times more numerous among 

 the women than among the men, whilst subsequently 

 they were only 3 times more numerous. Sal-vola- 

 tile cases were actually 23 times more numerous 

 in the women than in the men during the fatigue 

 period, though subsequently they were only 3 times 

 more numerous, just as were the faintness cases. 



The accident data for men, which are shown in the 

 middle portion of fig. i, indicate a very different 

 relationship from that observed in women. The 

 curve of hourly incidence of cuts was almost the same 

 in 1915, or the fatigue period, as in 1916, and, if the 

 accidents between 6.15 and 8.30 p.m. be excluded, 

 the total number of cases treated was almost the same 

 in both periods. Hence it follows that the men were 

 able to stand the excessively long hours even though 

 the women could not. In fact, I concluded from this 

 and other evidence that women ought to work only 

 nine hours a day if they are to fatigue themselves no 

 more than men engaged on similar work for twelve 

 hours a day. All the evidence I obtained went to 

 show that there was no over-fatigue in the men at any 

 time, and very little in the women when working a 

 ten-hour day. For instance, the hourly variations of 

 output during the course of the working day showed 

 very little signs of it. 



Hourly Output Variations. I was able to deter- 

 mine output variations in a very complete manner at 



