A technic has been devised for the estimation of the white blood cell count by examination of a stained drop of blood of standard size. The drop is measured by immersing a pinhead in the blood and then touching onto a microscope slide the blood which adheres to the surface of the pinhead. The drop is dried and stained and the count is estimated by comparing its microscopic appearance with photographs or "standard" preparations. It was developed to be used as a screening procedure in case of atomic war, but it may prove useful in epidemics or as a routine screening method in the hematology laboratories of large hospitals.

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