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A method has been developed by which the density and weight of an individual yeast cell can be measured with a reasonable degree of accuracy. The average weight of yeast cells in a cake is rather easily-determined by weighing out a gram of yeast and counting the number of cells with a hemacytometer, but measuring the weight of an individual cell presents a different problem, the solution of which is presented below. A resisting force is exerted on a body falling through a viscous fluid at rest. If the body is a sphere and if the flow is streamlined, i.e., no turbulence or eddying occurs in the wake of the sphere, the force exerted by the fluid is expressed by the following equation:

A Method for Determining the Weight of an Individual Yeast Cell*