File:American journal of physiology (1898) (14802170783).jpg

Identifier: americanjourn01ameruoft (find matches)
Title: American journal of physiology
Year: 1898 (1890s)
Authors: American Physiological Society (1887- ) American Physiological Society (1887- ). Abstracts of papers presented at the fall meeting American Physiological Society (1887- ). Proceedings
Subjects: Physiology Physiology
Publisher: (Bethesda, Md., etc.) American Physiological Society (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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g. Still another type was that of twofox-squirrels, active throughout the whole of the day and sleepingonly at night. Such differences indicate that an investigation of the 42 Colin C. Stewart comparative distribution of activity and of the relation of its intensityto its duration promises interesting and valuable results. Com-mencing, as did Hodge and Aikins,^ with the protozoa, it might bepossible to develop much that would bear closely upon theories ofanimal rhythm, rest and sleep. The following section will give a detailed account of the apparatusused, and of the general methods of procedure. Description of Apparatus and Methods.—The apparatus consistsprimarily of two parts : the cages in which the animals to be experi-mented upon are placed, and the various mechanisms for recordingtheir movements in these cages. Each of the cages (see Fig. i) usedthroughout the experiments on rats is cylindrical, eighteen incheslong by twenty in diameter, made of fine wire netting soldered to a
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Figure i. frame of stout steel wire. The cage revolves freely on a steel rodsupported by a fixed wooden frame. At one end is a wide-hingeddoor; from the axle is hung a Hght wooden nest-box, completelyclosed in but for a small round opening on one side; and to the endof the nest-box next the door is fixed a detachable tin feed-box oftwo compartments. At the opposite outer end of the cage is aneccentric which, with each revolution of the cage in either direction,pushes aside an upright lever attached to the wooden axle support,and in so doing pulls the wire connecting the cage lever with therecording apparatus. Cages used for mice are similar in construction, except that theirsmall size (eight inches long by five in diameter) renders them so Variations in Daily Activity. 43 light that no wooden support is needed for the axle. The axle isheld in position by a clamp upon an iron standard, while a secondclamp holds a bearing for the lever which, with its wire, serves as ameans of communica

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