File:Homing and related activities of birds (1915) (14563423518).jpg

Identifier: homingrelatedact00wats (find matches)
Title: Homing and related activities of birds
Year: 1915 (1910s)
Authors: Watson, John B. (John Broadus), 1878-1958 Lashley, Karl S. (Karl Spencer), 1890-1958
Subjects: Orientation Birds Terns Vision Archery
Publisher: Washington, Carnegie Institution of Washington
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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re dependent tosome extent upon adaptation and upon the absolute intensity of the ray oflight expo.sed. (2) The homing pigeon is not sensitive to infra-red rays, at least to thosewhich have approximately a length of X = 8000. Since neither a quartz nora rock-salt prism was at our disposal we could not give an ultra-violet light ofany intensity. The evidence on the violet end is clear, however, in view of thefact that the efficiency of the violet rays falls off apparently somewhat morerapidly for the pigeon than even for man. (3) Hess is unquestionably wrong when he states that the pigeon is blindto blue and violet. We have shown the contrary quite clearly, even in thenotes which we have presented in this paper. Our unpublished data showthat this animal is sensitive to all wave-lengths between the limits expressedin (1) above. (4) The young pigeon is positive to light, but is not so automatic in itsresponses as the young chick. THE ACaUISITION OF SKILL IN ARCHERY. By K. S. LASHLEY. 105
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EQUIPMENT FOR ARCHERY. Fig. I. Homewood target as it appeared to the archers. Fig. 2. Practice shed with equipment. Fig. 3. Target arranged for rifle practice. THE ACQUISITION OF SKILL IN ARCHERY. The great majority of experiments upon habit formation in man have dealtwith functions involved in implicit behavior; functions connected chiefly withthe speech mechanisms have received most attention. Improvement in suchactivities as addition, translation into code or from code, solving mechanicalpuzzles, cheeking letters on a printed page, or memorizing word material isdue almost wholly to increase in complexity of language habits. Practicein typewriting and musical technique is, in the beginning, followed by theformation of implicit* habits which later are dropped out to leave only thedirect sensory-motor reactions from eye to fingers. Improvement in writingand in telegraphy probably involve similar changes. In the study of all suchfunctions in human adults the subjects have already, at t

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