Abstract
The experiments here reported were undertaken with a view of ascertaining the relative efficiency of mercurochrome (especially the 2 per cent aqueous solution) and iodine solutions as disinfectants of the surface of the mucous membranes of the mouth. A further reason has been the general popularity of mercurochrome as a substitute for iodine in preoperative sterilization and for various therapeutic purposes within the oral cavity. Interest in this matter was aroused, indirectly, by the reports of Tinker and Sutton1in 1925 and 1926, and of Scott and Hill2in 1927, and by a very comprehensive report by Simmons3in 1928, all of whom have tested the relative bactericidal action of various mercurochrome solutions and other antiseptics, particularly iodine, from the standpoint of skin disinfection. Tinker and Sutton experimented with a 5 per cent solution of mercurochrome in 50 per cent alcohol, and a 5 per cent alcoholic

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