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 physiological virulence and inasmuch as they are but the first fruits of chemical research in this unsavoury domain we may well look forward with foreboding to what it will do in the future.

Thus far I have been treating of the aid that Science gives to the destructiveness of War. There is a brighter side to the picture. It comes to the assistance of the victims of its own devices. But here we come into a wider field of action. The ravages of War are not solely due to the destructiveness of the means of offence employed. Disease is as inseparable an accompaniment of War as wounds or death by violence and it used to be true that in War the loss of life and health due to disease was greater than that due to actual fighting. If this is changed for the better it is due to Science—the old causes are still present. Troops are sent into distant countries with different climates each with its special diseases and are thus placed in unaccustomed surroundings requiring different methods of life, and special hygiene if health is to be maintained. More important still are