A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . hedby the amount of dilution represents the number ofcorpuscles in a cubic millimeter. This method offered many difficulties: 1. CompU-cated artificial serum for dilution. 2. Introductionof blood without air into artificial tube difficult. to clean apparatus. Hayem andNachet devisedan instrument(h^niatimetre)by which theblood and serumare obtained intwo separatepipettes andthen mixed in aglass drop of thismixture is thenplaced upon aglass sli
A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . hedby the amount of dilution represents the number ofcorpuscles in a cubic millimeter. This method offered many difficulties: 1. CompU-cated artificial serum for dilution. 2. Introductionof blood without air into artificial tube difficult. to clean apparatus. Hayem andNachet devisedan instrument(h^niatimetre)by which theblood and serumare obtained intwo separatepipettes andthen mixed in aglass drop of thismixture is thenplaced upon aglass slide ar-ranged as fol-lows: A circularwell, similar tothat employedin the Thomaand Zeiss appa-ratus, is con-structed with the accurate measurement of onecentimeter in diameter and millimeter in eyepiece micrometer ruled in a large squarewhich is subdivided into sixteen squares is thenattached. One side of the large square measures J millimeter* (see Fig. 752). * One-fifth millimeter depth by one-fifth miUimeter on two sidesof square makes the block of blood one-fifth () cubic millimeter—5X5X5 = Fig. 752.—.\ppearance of Corpuscles withHayem and Nachets Instrument. Fig. 753.—Gowers Hemacytometer. (From Kirkeyof Physiology-. twelfth edition.) Handbook Gowers has described an instrument called thehemacytometer, which more nearh approaches per-fection than any already described; it therefore markswhat may be considered the border line between theancient and modern history of blood-counting by theactual enumeration method. Gowers instrument(see Fig. ) consists of: A, Small pipette (with rubbermouthpiece for suction) wliich, when filled (with dilut-ing fluid) to the mark on its stem, contains exactly995 cubic millimeters. B, Another pipette marked tohold 5 cubic millimeters (of blood). D, Glass jar formixing (blood and dUuting fiuid). E, Stirrer (to stirblood and diluting fluid in glass jar). C, Brass platewith a cell one-fifth () miUimeter i
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Keywords: ., bookauthorbuckalbe, bookcentury1900, bookdecade1910, bookyear1913
