. Medical diagnosis for the student and practitioner. of better appliances, the simplemethod represented by Fig. 50. In the former coagulationshould occur within from three to six minutes; by the simplermethod, in from two and one-half to five minutes. The latter pmerely involves the placing of several drops of the suspected blood uponslightly warmed microscope slides which are tilted upward at varying inter-vals until they appear as in B of the plate, the elapsed time representing thecoagulation period. Another rough but useful method consists in placingthe drop of blood upon a perfectly clea
. Medical diagnosis for the student and practitioner. of better appliances, the simplemethod represented by Fig. 50. In the former coagulationshould occur within from three to six minutes; by the simplermethod, in from two and one-half to five minutes. The latter pmerely involves the placing of several drops of the suspected blood uponslightly warmed microscope slides which are tilted upward at varying inter-vals until they appear as in B of the plate, the elapsed time representing thecoagulation period. Another rough but useful method consists in placingthe drop of blood upon a perfectly clean glass slide and passing a needlethrough it every twenty or thirty seconds until the needle drags the Boggs coagulometer consists of : (a) a round glass-bottomed moist * Reference to the extended original article is necessary. Keith, Rowntree and Ger-aghty, Archiv. Int. Med., Oct. 15, 1915, Vol. 16, No. 4, pp. 547-576. Oftenimportant. A B Fig. 50.—Delayed co-agulation ofblood, a sim-ple test.(After Da-Costa.) Normal 142 MEDICAL DIAGNOSIS. Courtesy of A. H. Thomas Co. chamber; (b) a cover fitting into and closing the chamber and carrying inthe center a cone of glass the truncate apex of which lies within the moistchamber; (c) a capillary tube opening into the side of the chamber throughwhich a jet of air can be pumped with a hand bulb so as to impinge upon thedrop of blood taken upon the tip of the glass cone for examination; (d) asmall opening in the upper surface of the cover of the chamber, which servesas an air outlet. Procedure.—The lobe of the ear is punctured and the time of appearanceof the blood accurately noted. The tip of the glass cone receives a blood drop,the cell is at once covered, thechamber is placed upon thestage of a microscope, and atintervals of 30 seconds a softcurrent of air is played upon the blood drop. Three essential FlG 5I>_The Brodie-Ri^eU co^d^teT « stages of movement are seen to en- modified by Boggs. sue as affecting the blood c
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