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—Bacteria vary greatly in size. Average rod-shaped bacteria are about ¹/₂₅₀₀₀ of an inch long, but there are undoubtedly organisms so small that they cannot be seen, even by means of the strongest microscopes we now possess.

Staphylococci. Streptococci. Diplococci. Tetrads. Sarcinæ. Fig. 2.—(Williams.)