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January 27, 1906

A Simple Method of Making a Blood Count.

JAMA. 1906;XLVI(4):291-292. doi:10.1001/jama.1906.02510310053017

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Baltimore, Jan. 16, 1906.

To the Editor:  —I have a clinical suggestion to offer your readers which I have found valuable. It is so simple that it may be a very common procedure, but if so I am not aware of the fact. In the Thoma-Zeiss blood-counting apparatus the lines on the counting scale which may be seen plainly under the microscope when there is no blood on the slide do not always show out clearly when the drop of blood has been covered with the cover slip and the slide made ready for the examination. In accurate work, when a large number of fields are counted, a great deal of time is lost, in the aggregate, in getting the proper portion of the slide under the lens, especially when the higher powers are used. For some time I have used a method which, while very simple, is not mentioned

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