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Every worker in the clinical laboratory, no doubt, has felt that in the construction of the hemomytometric slide undue prominence is given to the ruling for the enumeration of the red corpuscles, while as a matter of fact the leucocyte count is made much more frequently than the red count. In teaching, also, the red lines prove confusing to the beginner, and the patience of the instructor is often severely taxed in explaining again and again the meaning of the various lines. To overcome these difficulties, which seem entirely unnecessary, I have had E. Leitz & Co. construct a counting slide which is much simpler than any other with which I am acquainted. It will be found especially convenient in the enumeration of the leucocytes, but may also be utilized in counting the red cells. Its description and directions for use follow:
The instrument, as placed on the market,
SIMON CE. A NEW COUNTING CHAMBER FOR THE ENUMERATION OF BLOOD CORPUSCLES.. JAMA. 1906;XLVII(21):1737. doi:10.1001/jama.1906.25210210045002b