252 ENTOMOLOGY 



by flies and it is highly probable that certain other infections of the eye 

 are conveyed by the same means. Other diseases that are probably 

 carried by flies are anthrax, yaws and tropical sore. 



Dr. H. Graham has shown that the tropical disease known as dengue 

 is transmitted by the common mosquito, Culex fatigans. Dr. W. S. 

 Patton has proved that the deadly kala-azar is conveyed by a bedbug, 

 Cimex rotundatus, in India. 



In 1912 Professor M. J. Rosenau and Dr. C. T. Brues announced that 

 they had succeeded in transmitting infantile paralysis (poliomyelitis) 

 to monkeys by means of the stable fly, Stomoxys calcitrant, and their 

 results were confirmed by Dr. J. F. Anderson. Whether this is the usual 

 means of transmission among human beings it remains to be determined. 



Dr. Sambon's hypothesis that pellagra is transmitted by black- 

 flies (Simulium) has aroused considerable interest, but as yet no definite 

 relation between the fly and the disease has been proved to exist. 



