An Electronic Blood-Cell-Counting Machine

An electronic blood cell counting machine operating on a flow principle is described. It is quick and easy to use; it can perform a red cell count in ten seconds with an accuracy of ± 2.1 per cent (that is, 5000 cells counted in 10 seconds for a 5 M count). Leukocyte counts can also be performed in ten seconds with an accuracy of ± 9 per cent for a single count (500 cells counted in a 5000 cu.cm. count).