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Studies on the rate of thyroxine secretion (T.S.R.) in the horse, as measured from degradation of labelled thyroxine, are reported. In the resting horse, the mean T.S.R. was 0·49 mg./453·6 kg. (1000 lb.), with a mean value of PBI of 1·80 µ./100 ml., volume distribution of 60 1., and a half-life of 2·31 days. Partly and fully trained horses showed increases of 38% and 65% in T.S.R. associated with lower values for PBI and a greatly decreased half-life. During adaptation to cold, there was an increase of 66% in T.S.R. In horses adapted to cold, T.S.R. was increased by 17%. In pregnancy, the mean increase in T.S.R. of 18% was not statistically significant.