. The story of the mind. rvals of one, ten, twenty, and fortyminutes (this gives results by the method ofReproduction) ; second, to say whether a new setof squares, which were shown to them afterthe same intervals, were the same in size asthose which they had originally seen, smaller, orlarger (illustrating the method of Identification);third, they were shown a number of squares ofslightly different sizes, again at the same inter-vals, and asked to select from them the oneswhich they found to be the same size as those ori-ginally seen (method of Selection). The results from all these experimen
. The story of the mind. rvals of one, ten, twenty, and fortyminutes (this gives results by the method ofReproduction) ; second, to say whether a new setof squares, which were shown to them afterthe same intervals, were the same in size asthose which they had originally seen, smaller, orlarger (illustrating the method of Identification);third, they were shown a number of squares ofslightly different sizes, again at the same inter-vals, and asked to select from them the oneswhich they found to be the same size as those ori-ginally seen (method of Selection). The results from all these experiments werecombined with those of another series, securedfrom a large class of Princeton students; and thefigure (Fig. 8) shows by curves something of the I40 THE STORY OF THE MIND. result. The figure is given in order that the read-er may understand by its explanation the graphicmethod of plotting statistical results, which, withvarious complications, is now employed in psy-chology as well as in the other positive I. Method of Briefly described in words, it was found thatthe three methods agreed (the curves are paral-lel)* in showing that during the first ten minutesthere was a great falling off in the accuracy ofmemory (slant in the curves from o to lo) ; thatthen, between ten and twenty minutes, memory re-mained relatively faithful (the curves are nearlylevel from lo to 20), and that a rapid falling offin accuracy occurred after twenty minutes (shownby the slant in the lines from 20 to 40). Further, the different positions of the curvesshow certain things when properly curve secured by the method of Reproduction(not given in the figure) shows results which areleast accurate, because most variable. The rea-son of this is that in drawing the squares to re-produce the one remembered, the student is in- * This figure shows curves for two of the methods and Identification. HOW WE EXPERIMENT ON THE MIND. 141 fluenced b
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