In the hygiene of travel by land Gilbert commends a preliminary catharsis, frequent bathing, the avoidance of repletion of all kinds, an abundance of sleep and careful protection from the extremes of both heat and cold. The strange waters may be corrected by a dash of vinegar. Some travelers, he tells us, carry with them a package of their native soil, a few grains of which are added to the foreign waters, as a matter of precaution, before drinking. The breakfast of the traveler should be light, and a short period of rest after a day's travel should precede the hearty evening meal. Leavened bread two or three days old should be preferred. Of meats, the flesh of goats or swine, particularly the feet and neighboring parts, which, Gilbert tells us, the French call _gambones_, the flesh of domestic fowls and of the game fowls whose habitat is in dry places, is to be preferred to that of ducks and geese. Of fish, only those provided with scales should be eaten, and all forms of milk should be avoided, except whey, "which purifies the body of superfluities." Fruits are to be eschewed, except acid pomegranates, whose juice cools the stomach and relieves thirst. Boiled meats, seasoned with herbs like sage, parsley, mint, saffron, etc., are better than roasted meats, and onion and garlic are to be avoided. The primitive conditions of land travel in the days of Gilbert are emphasized by his minute directions for the care of the feet, which he directs to be rubbed briskly with salt and vinegar and then anointed with an ointment of nettle-juice (_urtica_) and mutton-fat, or with a mixture of garlic, soap and oil. If badly swollen, they should be bathed, before inunction, with a decoction of elder-bark and other emollients. In travel by sea, Gilbert tells us the four chief indications are to prevent nausea, to allay vomiting, to palliate the foul odor of the ship and to quiet thirst. For the prevention of nausea he recommends the juice of acid pomegranates, lemons, etc., or a decoction of parsley or sweet cicely (_cerfolium_). The traveler should endeavor to sit with his head erect, should avoid looking around, but maintain his head as immovable as possible, and support himself by a firm grasp upon some beam of the ship. Some sweets may be sucked, or he may chew a few aromatic seeds. If vomiting ensues, acid or sweet pomegranates, figs or barley-sugar (_penides_) may be taken sparingly, but no food should be ingested until the stomach is thoroughly quieted. Then the patient may take a little _stomatichon_ or _dyantos_, and a small portion of digestible food. As the diet must necessarily consist largely of salty food and vegetables, these should be cooked in three or four different waters, and then soaked in fresh water. A little aromatic wine will also benefit the patient, and a few aromatic seeds chewed in the morning are also of service.