It should be explained at this point that the results in all the efficiency-of-training tables of this chapter are arranged, as in the previous white-black discrimination tables, in tens, that is, each figure in the tables indicates the number of errors in a series of ten tests. In all cases _A_ and _B_ mark preliminary series of tests which were given at the rate of ten tests per series. The numbers in the first column of these tables designate groups of ten tests each, and not necessarily daily series. In Table 42, for example, 1 includes the results of the first five days of training, 2, of the next five days, and so on. The table shows that No. 80 made seven wrong choices in the first five series of two tests each. This method of grouping results serves to make the data for the different methods directly comparable, and at the same time it saves space at the sacrifice of very little valuable information concerning the nature of the daily results. It is to be noted, with emphasis, that the two-five tests per day training established a perfect habit after four weeks of training. This method is therefore costly of the experimenter's time. TABLE 42 EFFICIENCY OF TRAINING. WHITE-BLACK TESTS AT THE RATE OF 2 OR 5 PER DAY MALES FEMALES SETS 80 82 84 86 88 AV. 73 79 83 85 89 AV. OF 10 A 5 5 4 8 5 5.4 5 6 7 7 6 6.2 B 5 3 6 5 6 5.0 7 5 7 6 7 6.4 1 7 7 6 6 6 6.4 7 6 9 4 6 6.4 2 2 1 0 6 6 3.0 6 5 6 5 5 5.4 3 4 5 5 1 2 3.2 6 5 2 4 1 3.6 4 3 4 7 2 0 3.2 4 3 1 4 3 3.0 5 2 3 3 2 4 2.8 - 3 4 3 1 2.7 6 2 2 - 2 2 2.0 - 0 2 2 0 1.0 7 - 1 - 0 1 0.7 - 1 0 2 1 1.0 8 - - - 1 1 1.0 - 1 1 0 0 0.5 9 - - - 0 1 0.5 0 1 1 0 0 0.5 10 - - - 0 0 0 - 0 0 0 0 0 11 - - - 0 0 0 - 0 0 0 12 - - - 0 0 - 0 0 0 TABLE 43 EFFICIENCY OF TRAINING. WHITE-BLACK TESTS AT THE RATE OF 10 PER DAY MALES FEMALES SETS 210 220 230 410 420 AV. 215 225 235 415 425 AV. OF 10 A 6 5 6 6 6 5.8 8 4 4 8 5 5.8 B 6 8 8 5 1 5.6 8 7 6 6 2 5.8