Case i.?Aged 3 years. Was admitted suffering from lobar pneumonia, during which cerebral symptoms developed. At the necropsy there was well-marked croupous pneumonia and pleurisy, together with suppurative infiltration of the lateral ventricles of the brain, without general meningitis. Friedlander's pneumo-bacillus was isolated from the lung and from the pus on the ependyma. Case 2.?Aged 21 yea...