(From caleo, to make hot). It is a violent ardent fever, in which a delirium comes on both early and suddenly. It happens to those who sail into very hot countries. Dr. Oliver gives the history of a case in the Philos. Trans. Abr. vol. iv. in which he observes, that when the delirium came on, the patient imagined that he was in green fields; that after a free bleeding he slept, and waked without any other complaint than weakness from the loss of blood, and soreness from struggling during his delirium. He further adds, that this fever attacks in the night, whence the patient, under the notion of green fields, runs into the sea before any one is aware, so that few of these cases occur to observation. Dr. Shaw advises, that the patient should indulge in rest, be bled freely, take a few hours afterwards an emetic; dilute plentifully with barley water, and that a blister should then be applied. It is probably a species of phrenitis, though of the milder kind, and of the nature of the coup de soleil. C. Stubbs in the Philos. Trans. N° 36.