“…Despite the contention of Rosenberg and Sylvester (1944) that 24-40,000 units of penicillin administered intramuscularly or intravenously were sufficient to produce reasonable penetration into the C.S.F. in meningitic cases, the consensus of opinion has been that intrathecal therapy is necessary in pneumococcal meningitis (Rammelkamp and Keefer, 1943;Smith et al, 1944,1946;Anderson, 1945;Smith, 1945;Ross and Burke, 1946).…”