PHILOSOPHICAL PERIODICALS. 127 discrete succession at large.] Vol. xii., No. 6. J. H. Leuba and W. Hyde. ' Studies from the Bryn Mawr College Psychological Laboratory : An Experiment in Learning to Make Hand Movements.' [Experiments on the reading and writing of German script. Psychophysical analysis ; the influence of reading on writing, and conversely ; fatigue ; fluctuations in efficiency.] G-. M. Parker. ' A Study of the Motor Phenomena in Chorea.' [Choreic movements are not biologically inco-ordinate. There is a hierarchy of movements, in which the more complex are compounded from the more simple ; in chorea, there is inhibition of the higher motor systems, and consequent reversion to primal, simple, fixed movements which were of utility in earlier evolutionary stages.] H. B. Thompson. ' Studies from the Psychological Laboratory of Mount Holyoke College.' Gr. M. Fernald. ' The Effect of the Brightness of Background on the Extent of the Colour Fields and on the Colour Tone in Peripheral Vision.' [The colourless background appears to intensify the component colour least like and to obliterate the colour most like itself in brightness. In the case of orange and yellow, the field is widest when the brightness contrast between colour and ground is greatest.] Editor's Announce- ment. AMERICAN JOURNAL OF PSYCHOLOGY. Vol. xvi., No. 3. E. A. McC. Gamble, C. E. Pitkin and E. Foster. 'Attention and Thoracic Breathing.' [Report of experiments with adults, students, children and dogs, on changes in form and rate of breathing as accompanying changes in degree or stability of attention. The most constant correlation is that of acceleration of slow breathing with rise in level of attention ; next stands variation in length of expiratory pause with variation in stability of attention.] M. Meyer. ' Auditory Sensation in an Ele- mentary Laboratory Course.' [Outlines simple quantitative experiments, especially on difference-tones.] B. B. Andrews. ' Auditory Tests. n." [Discusses tests of musical capacity, and diagnostic tests of hearing.] E. C. Sandford. ' Minor Studies from the Psychological Laboratory of Clark University.' L. D. Arnett. ' xvm. Counting and Adding.' [The psychical counting mechanism is essentially like the ordinary mechanical counters ; an important element in throwing it into operation is voluntary movement. The section on adding contains notes of pro- cedure and rate of work.] F. Kuhlmann. ' The Place of Mental Imagery and Memory among Mental Functions.' [Discusses, with critical refer- ence, the validity of ' ability to learn ' as a criterion of mind, and as a criterion of the existence of the memory-image ; the role of the image in the process of learning ; and its role in human life, as now constituted.] B. H. G-ault. ' On Conditions Affecting the Maximal Bate of Voluntary Extensor and Flexor Movements of the Right Arm.' [Discusses the effect of various extents of running start ; the MV oi the average rate of movement ; the back pressure or backward start and its duration ; practice, fatigue and the differential rate of flexor and extensor move- ments.] Literature. F. Kuhlmann. ' Recent Studies of Normal Illusions of Memory.' Book Notes. Books Received. Vol. xvi., No. 4. BL C. Stevens. ' A Plethysmographic Study of Attention.' [Report of 135 experiments on the state of active attention. Conclusions : (1) Changes in rate of pulse and respiration are brought about by the psychophysical process of sensation ; (2) every sensory stimulus, probably in proportion to its intensity, tends to produce a fall in volume ; (3) inhibited respira- tion is a characteristic of active attention.] Z. M. Bentley and G-. H. Sabine. 'A Study in Tonal Analysis. I.' [Preliminary report of ex- periments with rotating fork, with critical reference to previous work.] E. H. Hollands. 'Wundt's Doctrine of Psychical Analysis and the
