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One of the chief advantages of this new method is the possibility of obtaining curves of learning for the solution or attempted solution of relational problems of varying difficultness. I am confident that these curves of learning will prove far more valuable than such data as are yielded by the puzzle-box method.
The passion for intricate and far-sought metaphor which had possessed Donne was accompanied in his work and even more in that of his followers with a passion for what was elusive and recondite in thought and emotion and with an increasing habit of rudeness and wilful difficultness in language and versification.
Why, howadji, it was with a difficultness that I kept them from running away and enhiding themselfs in the mountains, lest the soldiers of the pasha come upon them at once and punish them for trying to make strike!
Clearly, then, our ignorance is due not to lack of appreciation of the scientific value of primate research but instead to its difficultness and costliness. Strangely enough, the practical importance of knowledge of the primates has seldom been dwelt upon even by those biologists who are especially interested in it.
The difficultness of the daily tasks appears to be reliably indicated by the tendency to yawn. Systematic work on problem 3, which has been defined as alternately the first door at the left and the first door at the right of the group, was begun August 19, and for nine days a single series of ten trials per day was given. Work then had to cease because of the experimenter's return to Cambridge.
The choices were made easily and with certainty, and the only mistake, that of setting 7, was apparently due to carelessness. This excellent showing for the control series wholly justifies the comparison of problems 2 and 3 as to difficultness, made above.