Rhases remarks that he had known all persons who had been exposed to great heat during a journey suffer from attacks of fever, except those of a humid and phlegmatic temperament. He forbids much food before setting out on a journey, and even approves of getting bled and purged, if the undertaking be severe. He recommends, if convenient, a bath at the close of the day; then the traveller is to eat and go to sleep. He and all the authorities quoted by him direct the body to be rubbed with oil before and after a journey. To preserve the eyes from the effects of snow and dust, he recommends them to be exposed to the vapours produced by pouring wine on a heated stone, or to those of chamomile, dill, or marjoram. To protect the feet, he directs them to be wrapped in cloths smeared with calefacient oils. When very hot, he cautions against swallowing much cold water at once, but recommends some cool liquid to be held in the mouth, and cold water to be poured on the hands and feet. He recommends travellers to chew pickled onions. During the prevalence of extreme cold he approves of drinking some hot wine before setting out on a journey. When the journey is over, he directs the traveller to go into a comfortable apartment, but not to approach the fire, nor enter the bath, nor allow himself to sleep during the space of an hour. After this he may go into the bath, and undergo friction until his body become ruddy, and then he may go to sleep on a soft bed; by which regimen he may be preserved from fever, if such be the will of God. (Cont. xxxiv, Ad Mansor. vi, 3 and 4.) SECT. LVI.—OF THE REGIMEN OF PERSONS ON BOARD SHIP. With regard to the vomitings which occur to people at sea, it is neither easy nor expedient to contend with those which happen first; for, upon the whole, they are generally beneficial. After vomiting, one ought not to partake of much nor of ordinary food, but either lentils, dried and boiled with a small quantity of pennyroyal, or bread pounded in a weak and fragrant wine. One ought also to use but little drink, and that containing a weak watery wine, or vinegar with honey. The lentils ought to be first boiled, and then when they become soft, to be triturated, and afterwards dried and put into an earthen vessel. When severe vomiting lasts for a long time, one should resolutely abstain from all kinds of food, and take only a little drink, which ought to be vinegar and honey with water, containing thyme infused in it, or pennyroyal water with some fine polenta, or some fragrant weak wine with fine polenta also. In order to overcome the disagreeable stench on board ships, one may smell to quinces, thyme, or pennyroyal. One ought also to look as seldom as possible upon the sea, until one has been accustomed to live in a ship. One must likewise attend, that the water which is drunk be not muddy, ill-smelled, or saltish. * * * * *