Chicago medical journal and examiner . and which need not be detailed. Regarding the use of high powers, Dr. Beale says, in the lastedition of his book, that they are absolutely necessary to thestudy of the minute structure of organized matter. I havemyself long been convinced of this fact. In studying blood, all my observations have been made witha power giving 1,275 diameters; and in observations on renaldiseases, cancers, etc., it is necessary, in most cases, at somestages of the investigation, to resort to the use of such highpowers. Often, with the exclusive use of low powers, objects wou
Chicago medical journal and examiner . and which need not be detailed. Regarding the use of high powers, Dr. Beale says, in the lastedition of his book, that they are absolutely necessary to thestudy of the minute structure of organized matter. I havemyself long been convinced of this fact. In studying blood, all my observations have been made witha power giving 1,275 diameters; and in observations on renaldiseases, cancers, etc., it is necessary, in most cases, at somestages of the investigation, to resort to the use of such highpowers. Often, with the exclusive use of low powers, objects wouldbe wrongly named or entirely overlooked, which would at onceattract attention when highly magnified. ILLUSTRATING MICROSCOPIC OBSERVATIONS. 197 In both of the accompanying plates may be seen objectswhich could not have been recognized, or scarcely seen even,by a power of 200 diameters. Let any one try to examineblood discs under this power, and they will at once perceivehow inadequate it is for the purpose. Recently a slide of dried. Plate 1. In Plate 1, a indicates air bubbles, two of them resting upon an epithelialcell; &, oil globules; cc, epithelial cells; d, vibriones; e, torula cerevisiae;y, granular casts from the tubuli uriniferi; 7i, a mass of deep orange col-ored crystals, perhaps chloride of ammonium. Fragments of casts, etc.,are seen scattered over various parts of the plate. human blood was submitted, with the remark that it had beenexamined under such a power, and found to contain a largeproportion of white blood discs. Upon examination with ahigh power, barely the normal number could be , we have under examination a specimen of urine which 198 CHICAGO MEDICAL JOURNAL AND EXAMINER. contains bodies the most practiced observer would try in vainto distinguish under a power of 350 diameters; with a powerof 1,200 they are seen to belong to certain species of bodies are frequently found in urine. They are doubt-less introduced through t
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectmedicine, bookyear187
