“…of the approved Haldane method, as read by most observers, is equivalent to 14.8 g. (King, Gilchrist and Matheson, 1944) or 14.7 g. (MacFarlane and O'Brien, 1944) of haemoglobin per 100 ml. Mackay, Dobbs and Bingham (1945) found that addition of iron, in physiological amounts, had no effect on the concentration of haemoglobin in the blood of children, although iron, in doses much above the amounts that occur in food, raised the concentration (see Davidson and Donaldson, 1944).…”