CLEANLINESS OF SURROUNDINGS.--Men should be taught that cleanliness of surroundings is not merely for purposes of inspection; but that it is absolutely necessary where a great number of men are living together in close quarters. Quarters should be well policed; the company street should be kept clean; refuse of all sorts should be kept in receptacles provided for that purpose and frequently removed. A police squad appointed daily should be charged with this work, and the corporal of the same made responsible for the condition of quarters and the company street. PREVENTABLE DISEASES.--Men should be given a certain amount of theoretical knowledge of preventable diseases. These matters will be taken care of to a large extent by the Medical Corps; but men should be taught just what precautions are necessary to avoid recourse to the hospital. VENEREAL diseases have already been touched upon. TYPHOID FEVER is a germ disease and communicable. Vaccination is the first preventive; protection of water supply is the second; thorough disposal of wastes is a third; and sharp punishment for violation of sanitary regulations is a fourth. Habits of personal cleanliness will do much to prevent any such disease. DYSENTERY is very common in field service, but may be prevented by same methods as for typhoid fever, save for vaccination; men suffering from this malady should be isolated, if possible, and utmost precaution taken to prevent spread of the disease. MALARIA is a mosquito disease; get rid of mosquitoes and then you will get rid of the carrier of the germs. Quinine may act as a preventive. Cases should be isolated, if possible. TONSILITIS AND COLDS may be combatted very effectively by proper precautions as to ventilation. MEASLES.--Very important but little known; isolation recommended. There are many other diseases concerning which the men should be instructed, but lack of space prevents further treatment of them. They should be taught the proper treatment of blistered feet, for they incapacitate a great many men; the chief causes are ill-fitting shoes and our old friend "uncleanliness." Shoes are the most important article of clothing of the infantryman; each man should have one pair well broken in for marching, and two other pairs. Socks should be soft, smooth and without holes--also _clean_. Further steps for the prevention of blisters are; hardening of the skin by appropriate baths for the feet; soaping the feet; or adopting some other means of reducing the friction of the foot against the sock. _Treatment_--Wash the feet; open the blister at the lowest point, with a clean needle; dress with vaseline or other ointment and protect with adhesive plaster, care being taken not to shut out the air. Zinc oxide plaster is excellent. Sterilize a needle; thread it with a woolly thread and run it through blister, leaving ends projecting about one-half inch; this will act as a wick and dry up blister in short time.