GROUP XXIV. INSTRUMENTS AND APPARATUS OF HYGIENE, MEDICINE, SURGERY, PROSTHESIS, Etc. Class 272.—Medicines; officinal (in any authoritative pharmacopoeia); articles of the materia medica; preparations, unofficinal. Class 273.—Dietetic preparations, as beef extract and other articles intended especially for the sick. Class 275.—Instruments for physical diagnosis, clinical thermometers, stethoscopes, ophthalmoscopes, etc. (except clinical microscopes, etc., for which see Class 324). Class 276.—Surgical instruments and appliances, with dressings, apparatus foi deformi ties, prosthesis, obstetrical instruments. Class 277.—Dental instruments, appliances and materials. Class 278.—Vehicles and appliances for the transportation and relief of the sick and wounded, during peace and war, on shore or at sea. Mineral waters. vii