Digest of comments on The pharmacopia of the United States of America and on the National formulary .. 1905-1922 . Of course at a distance of 10 inches such a light generatesenough heat to warm 2 c. c. of solution to 30° or more, dependingupon the room tem{)erature. In order to avoid not only such hightemperatures, but more especially fluctuations in the same, thewater bath, indicated in figure 1, was devised. It is constructed insuch a way that the glass container rests in a current of water, thetemperature of which is so regulated tliat the temjjerature of the solu-tion in the container can
Digest of comments on The pharmacopia of the United States of America and on the National formulary .. 1905-1922 . Of course at a distance of 10 inches such a light generatesenough heat to warm 2 c. c. of solution to 30° or more, dependingupon the room tem{)erature. In order to avoid not only such hightemperatures, but more especially fluctuations in the same, thewater bath, indicated in figure 1, was devised. It is constructed insuch a way that the glass container rests in a current of water, thetemperature of which is so regulated tliat the temjjerature of the solu-tion in the container can also be kept constant. Preliminary experiments demonstrated that a mere naked ej^eobservation of the changes in size of the ])upil is of little value, andso an instrument of precision was sought that would enable the177—Bull. 55—09 4 50 observer to express in luilliinetcrs the exact lengtli of tlie long andshort axes of the pupil. The device which proved to be most satis-factory was made for me by Messrs. Gaertner & Co., of Chicago. Theirsimple comparator was modified by the author to meet the needs. Fig. 2.—Pupilomotor. 2a, Reading microscope with cross wires; 26,ter slide- (soo fig. 3); 2c, adjustable .substagc (see fig. 4); 2d, support;2e, water bath (see fig. 1). Temperature regulators and light omitted torsake of clearness. of the present series of experiments. (See fig. 2.) The essential partsof the apparatus are, (1) a reading microscope with cross wires in theeyepiece (fig. 2a), (2) a micrometer slide (fig. 2b and fig. .S), (3) an 51 (ij iistable stage (fig. 2c and fig. 4), and, finally, (4) a support (fig. 2d).lir iTcjss wire in the eyepiece furnishes a point of reference, and innaking a reading tlie eye is first oriented so as to liring its opticaldigestofcomments55nati
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