A, the most common type, highly amœboid and phagocytic. Its protoplasm is finely granular, its nucleus multipartite.
B, a leucocyte closely similar to the last, but larger, and containing an undivided nucleus. It is shown with a cluster of particles of soot in its body-substance.
C, a young leucocyte, or “lymphocyte.”
D, a coarsely granular leucocyte. Its granules stain brightly with acid dyes—e.g., eosin or acid fuchsin.