Infantile diarrhoea and vomiting.

be considerably delayed. Thus, a normal chloride level is not incompatible with the diagnosis of tuberculous meningitis, for the level may become appreciably reduced only at an advanced stage in the disease process. Table 2 summarizes the important changes in the cerebro-spinal fluid. It will be seen that variations between the cellular and chemical responses are of great value in diagnosis, though for ultimate identification additional investigations usually prove necessary. The differences in cellular and chemical responses also serve to emphasize the classification of the causes of meningeal irritation pr-vio,usly advanced on an aetiological basis.