The endemic diseases of the southern states . blood. While Laveran made his discovery with a one-sixth-inch lens,only a one-twelfth-inch oil immersion lens, with appropriatecondenser and diaphragm, should be employed, and the mechanicstage greatly facihtates the work. Thin slides and cover-glasses should be used. While stained films of the blood have a wider field of useful-ness to the general practitioner than preparations of theunstained blood, he should become familiar with the technicof each. When about to obtain blood to be examined, fresh and un-stained, several slides and cover-glasses,
The endemic diseases of the southern states . blood. While Laveran made his discovery with a one-sixth-inch lens,only a one-twelfth-inch oil immersion lens, with appropriatecondenser and diaphragm, should be employed, and the mechanicstage greatly facihtates the work. Thin slides and cover-glasses should be used. While stained films of the blood have a wider field of useful-ness to the general practitioner than preparations of theunstained blood, he should become familiar with the technicof each. When about to obtain blood to be examined, fresh and un-stained, several slides and cover-glasses, having been washedthoroughly with soap and water, then with alcohol, should berubbed thoroughly with an old, clean handkerchief and gentlywarmed. While the blood may be obtained elsewhere, thelobe of the ear has advantages over other locations: it is lesssensitive, it being possible to obtain blood from sleeping childrenwithout awakening them; the instrument and the blood may bekept from the view of the patient, an advantage when deaHng 143. Fig. 39.—Obtaining the blood between slide and cover-glass. 144 ENDEMIC DISEASES OF THE SOUTHERN STATES with children and nervous persons. More blood is easily ob-tained if desired to make a hemoglobin estimation, blood count,or Widal test. The lobe of the ear should be cleaned withsoap and water, then with alcohol, and should be dried thor-oughly. It is then grasped between the thumb and forefinger,the latter uppermost. The puncture is made preferably witha large straight Hagedorn needle and should be made quicklyto the depth of about one-eighth inch. The first one or twodrops should be wiped away and one chosen which is not toolarge. The cover-glass, held by diagonal corners between the thumband forefinger or, better, by means of forceps, is applied to thesummit of the blood-drop and laid face down upon the must be taken to touch only the top of the drop and notthe skin, otherwise the blood smeared upon the cover-glass willh
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