Infective meningitis is the most frequent of the serious complications of otitis media and mastoiditis. No successful method of treatment has been developed that offers more than an occasional recovery. The anatomic structure of the brain coverings, with their innumerable spaces, recesses and pockets, for the most part inaccessible, makes drainage as applied to other parts of the body impossible except to a limited degree.Certain facts that are known about meningitis were summarized by Jackson and Coates1 as follows : (a) meningitis is at first a localized disease, with more or less a latent stage; (b) surgical drainage of this area while the process is still localized would result in many recoveries ;(c) later, with formation of exudate and blockage of the cisterns of the base of the brain, the condition becomes hopeless, and (d) the symptoms of meningitis as now accepted are those of the terminal stage. By streptococcic meningitis of otitic origin is meant an infection which originates in the middle ear, involves the meninges, producing there chemical and serologie changes, causing organisms to appear in the spinal fluid and clinically setting up symptoms of meningitis.Neal, Jackson and Applebaum 2 analyzed 623 cases of meningitis other than meningococcic or tuberculous. In this classification, strep¬ tococci were the cause in 205 cases, pneumococci in 214 and influenza bacilli in 118. The remaining 60 fall into nine groups, each due to a different type of organism. In 121 of the 205 cases of streptococcic men¬ ingitis the disease was produced by infection of the ear or the sinuses. The hemolytic type was predominant and infection of the ear was the most common cause. Williams 3 stated that little is known of the inci¬ dence, either seasonal or geographic, or of agglutination types among