INTRODUCTION
Among the numerous and remarkable advances which have been made in the realm of medical science within the last two decades, none has created so wide a public interest, none has been fraught with consequences affecting so large and widespread a proportion of the world's inhabitants, and destined to affect the future welfare and progress of mankind to so great a degi'ee, as the gi'adual discovery of the role which insects play in the dissemination of disease. Malaria, which has had a far-reaching effect on the history of the world and on the immigration of the white man into new regions of the earth, and which in India alone imposes a tax of over a million human lives each year, has been shown to be conveyed by the mosquito. Plague, which in all ages has created terrific devastation, sweeping away millions of lives, transforming populous cities into deserted wildernesses, was found to be transmitted by the flea. The " black sickness," or Kala Azar, which has decimated districts and depopulated areas in the tropical countries where it occurs, has been found to be due to a parasitic organism which can be transmitted by the bed-bug. Sleeping sickness, which numbers its victims by the hundred thousand, depends for its distribution upon the tse-tt ^ fly. Lice have been shown to transmit the causative organism ....
Among the numerous and remarkable advances which have been made in the realm of medical science within the last two decades, none has created so wide a public interest, none has been fraught with consequences affecting so large and widespread a proportion of the world's inhabitants, and destined to affect the future welfare and progress of mankind to so great a degi'ee, as the gi'adual discovery of the role which insects play in the dissemination of disease. Malaria, which has had a far-reaching effect on the history of the world and on the immigration of the white man into new regions of the earth, and which in India alone imposes a tax of over a million human lives each year, has been shown to be conveyed by the mosquito. Plague, which in all ages has created terrific devastation, sweeping away millions of lives, transforming populous cities into deserted wildernesses, was found to be transmitted by the flea. The " black sickness," or Kala Azar, which has decimated districts and depopulated areas in the tropical countries where it occurs, has been found to be due to a parasitic organism which can be transmitted by the bed-bug. Sleeping sickness, which numbers its victims by the hundred thousand, depends for its distribution upon the tse-tt ^ fly. Lice have been shown to transmit the causative organism ....
