“…This suggested a magnesium-controlling system in homoiotherms. The adrenal cortex is over-active in cold-exposed mammals (Munday & Blane, 1960, 1961Smith & Hoijer, 1962), and this, coupled with recent reports relating adrenocortical hormones with magnesium metabolism (Hingerty, 1957;Davanzo, Crossfield & Swingle, 1958;Hanna & MacIntyre, 1960), prompted the following investigation.…”