. A practical treatise on medical diagnosis for students and physicians . Gowers haemoglobinometer. occur if the blood were first put in the tube. The finger or lobe of theear, previously cleansed with water and ether, is then deeply stabbedwith the lancet, so that the blood will flow freely, care being taken toavoid squeezing the punctured part; 20 cubic millimetres of blood arethen quickly drawn up in the capillary tube and at once blown into thegraduated tube, which is shaken to allow the blood to become diiFused inthe water. The tubes containing the standard coloring-matter and thediluted
. A practical treatise on medical diagnosis for students and physicians . Gowers haemoglobinometer. occur if the blood were first put in the tube. The finger or lobe of theear, previously cleansed with water and ether, is then deeply stabbedwith the lancet, so that the blood will flow freely, care being taken toavoid squeezing the punctured part; 20 cubic millimetres of blood arethen quickly drawn up in the capillary tube and at once blown into thegraduated tube, which is shaken to allow the blood to become diiFused inthe water. The tubes containing the standard coloring-matter and thediluted blood are now held up, side by side, against a sheet of paper,and distilled water added, drop by drop, with repeated shakings, until thecolors in the two tubes match. The height to which the column of dilutedblood and water has risen in the graduated tube represents the percentageof hsemoglobin contained in the blood tested. X w< Oh. FLEISCHLS ILEMOMETER. 579 Fleischls haemometer consists of a small metal table with an aperturein the middle, under which is a reflector made of plaster-of-Paris. Theopening is occupied by a small well having- a glass bottom and dividedinto two equal compartments. The standard color of the blood at differ-ent dilutions is represented by a wedge of glass, colored with Cassiuspurple, which is, of course, pale in color at the extreme edge and deepensin intensity with its thickness. This wedge of glass is moved under thetable by a rack and pinion, and is accompanied by a graduated of the well receives simply the light from the plaster-of-Parisreflector, while the other rests upon the ruby glass and obtains lightthrough it. The light from a candle, gas-jet, or oil lamp must be small pipette and several capillary tubes about f inch in length, andmounted on slender metal handles, are employed to obtain the necessaryamount of blood; each tube will hold sufficient normal
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