Among the factors that determine the affective value of any visual presentation (such as color, subject, balance, light and shade), line forms have occupied an important position in the opinions of writers on Aesthetics. Cox 1 says • Straight lines will always express rigidity and stiffness while curves will express some sort of growth or motion The vertical line is a line of stability, of strength and vigor .... All these characteristics of lines may be the result of association or they may have some deeper reason, but they are there, in the lines themselves, without regard to what the lines may be used to represent, and are the most valuable means to artistic expression.
In the course of an investigation of the effects of continuous physical and mental work 1 a series of reports was obtained from the subjects doing mental work in regard to their feelings. The relation between changes m output of work and changes in the feehngs will be discussed in this paper.Four forms of mental work 2 were used, each continued for approximately five and one-half hours, or until the subject refused to work longer. They were:1. Continuous addition which consists in adding to a twoplace number first 16, then 17, then 18, then 19, then 16, etc. At the end of each 30 seconds a new two-place number is given The score is in terms of number of additions done correctly per 30-second period. At the end of each half hour of work the subject reported how he felt, in terms of a scale which will be described later.2. Sentence Completion A series of 39 sets of Sentence Completion material taken from the Thorndike Entrance Examination for High School Graduates, divided into groups of 24 or 36 according to difficulty. Twenty-one minutes were allowed for work on each group, the score being in terms of amount of work done correctly m that time. At the end of each 21 minutes the subject reported how he felt.3. Judging Compositions. A series of 130 compositions 1 This is an investigation made possible by the Ernest Kempton Adams Research Fellowship granted for the year 1922.2 The conditions of the experiment and description of material together with tables of original data have been published in the American
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