It is a recognised fact that nervous and mental disorders are more frequent after influenza than after any of the other zymotic diseases. Dr. Risien Russell has specially referred to the action of the influenza bacillus and its toxin on the nervous system. Dr. Clouston has expressed the opinion that the effects of influenza on the mental condition of Europe far exceeded in destructive powers all the continued fevers put together. An increase in the admissions of melancholic patients into several of the asylums of this country during the prevalence of influenza has been reported at Edinburgh, Hanwell, Birmingham, Nottingham, and other institutions. Dr. Macpherson and Dr. Farquharson have discussed the pathological aspects of depressed emotions, and the physical reduction caused by influenza, as favourable to the onset of melancholia.