(11) The number of letters counted in thirty seconds was determined by the use of the lines of letters at the bottom of the sheet. The subjects began at the left of each line and counted singly as many letters as they could between the "start" and "stop" signals of the experimenter. They then marked the last letter counted and immediately recorded, in the place provided on the record-sheet, the number of letters counted.
(12) The pulse was counted by the experimenter immediately after the experiment when possible and the rate recorded on the sheet.
(13) The experimenter avoided delays, interruptions, or other irregularities in the course of the series of experiments.
The materials for our discussion of the sex-differences in time-estimation consist of the judgments of 251 males and 274 females. The majority of the males were students in Harvard College, the majority of the females, in Radcliffe and Smith Colleges. The remainder of the records were obtained in Ohio State University, Pomona College, and West Chester State Normal School. The authors gratefully acknowledge their indebtedness for assistance in the obtaining of records to Professors A. H. Pierce, T. H. Haines, W. H. Scott, D. R. Major, A. M. Smith, H. A. Miller, and B. T. Baldwin. The males ranged in age from 17 to 23 years, the females from 17 to 20. The total number of judgments, the distribution of which among the various ages is shown in Table 1, is 4014 for the males, 4375 for the females.
Despite the fact that our experiments are open to the criticisms of all work done under variable conditions and by different experimenters, it cannot be doubted that the results indicate certain sex-differences in time-estimation which suggest additional problems. For the present we refrain from interpretations for the most part and state merely the statistical results of the investigation.
Previous studies of the "time-sense" and the conditions which influence time-estimation suggested to us the desirability of examining our data with reference to (1) sex-differences in estimates of intervals, (2) age-differences, (3) the influence of different fillings, and (4) differences dependent upon the length of the interval. The results have been studied, therefore, with reference to the significance of sex, age, filling, and length of interval, but as no marked age-differences appeared, the detailed tables which were constructed to exhibit the results for the subjects of each year of age have not been printed.
In all the tables the results for males and females are presented separately. The judgments for the sixteen intervals are arranged with reference to the length of the interval, not in the order in which they were taken; all the 18ʹʹ intervals, for example, are grouped (Table 2). The letters I, E, R, W, refer to the fillings of the intervals.
TABLE 1
NUMBER OF SUBJECTS, AGE, SEX, AND NUMBER OF JUDGMENTS
| Males | ||
| Age | No. of subjects | No. of judgments |
| 17 yrs. | 16 | 256 |
| 18 | 27 | 432 |
| 19 | 40 | 639 |
| 20 | 67 | 1071 |
| 21 | 50 | 800 |
| 22 | 35 | 560 |
| 23 | 16 | 256 |
| Totals | 251 | 4014 |
| Interval | No. of judgments | |
| 18" | 1004 | |
| 36" | 1003 | |
| 72" | 1003 | |
| 108" | 1004 | |
| Total | 4014 | |