Abstract
The average weight of the thyroid is lower in the Jamaican than in the British and American infant. The Jamaican foetal thyroid is smaller than the American foetal thyroid. The thyroid is smaller in the malnourished than in the relatively well nourished, but differentiation is normal and fetal appearances are not seen. A surprising absence of histological change suggests that thyroid function may be unchanged even in fatal cases of malnutrition. No correlation was found between the amount of fat in the liver and thyroid activity as assessed histo-logically.