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[1] For the estimation of the numbers of white corpuscles, relatively to the red, and of the different kinds relatively to each other, see the section on the morphology.

[2] In Roy's method, mixtures of glycerine and water are used. By means of a curved pipette, the drop of blood is brought into the fluid, and its immediate motion observed. Lazarus Barlow has modified this method. He employs mixtures of gum and water, and instead of several tubes, one only; and into this the mixtures are introduced, those of higher specific gravity being naturally at the bottom. The alternate layers are coloured, and remain distinguishable for several hours.

[3] In conditions of shock experimentally produced, the specific gravity of the total blood is increased, that of the plasma, however, is diminished (Roy and Cobbett).