Dr. J. M. Hamill makes out a clear theoretical case for the substitution of the millilitre (ml.) for the cubic centimetre (c.cm.). He expresses regret at the obduracy of our profession in adhering to the incorrect use of the cubic centimetre as a measure of volume. Unfortunately, perhaps, the mischief does not end there. The cubic millimetre (cu.mm.) is universally used in the data of haematologists. As a metrical purist, would Dr. Hamill advocate the substition of the microlitre, and would he

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... uggest a suitable abbreviation for this quantity?-I am, etc., Manzhester.