Abstract
Recent writers on the subject of encephalitis accompanying smallpox, measles and vaccinia have been tempted to include in the same group cases showing nervous manifestations in the course of chickenpox. However closely the clinical manifestations of encephalitis in the latter disease resemble those in the maladies mentioned, it is nevertheless a fact that the encephalitis following chickenpox is included in this common group on a purely hypothetic basis, as no anatomic study is available of the alterations in the brain from a patient dying of an encephalitic process in the course of varicella. 1 The pathologic changes in the cerebral complications of smallpox, measles and vaccinia are now established as being of a fairly constant and uniform appearance, but the cerebral alterations in other infectious diseases, like pneumonia, septicemia and whooping cough are varied. To attempt, a priori , to classify cases of unexplored pathologic pictures would seem unwise, no matter
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