CARRIAGE OF DISEASE 137 



by flies from such material when left exposed in a 

 latrine pan. 



Another experiment, with a woolen blanket smeared 

 with a fresh sample of feces from a carrier and doubled 

 so that the smear was outside, gave the result that the 

 bacillus was recovered at every examination up to and 

 including the fortieth day. In this experiment the 

 sample used was a liquid stool, the result of a saline 

 aperient, and portions of the blanket fiber were 

 pulled out from the soiled portion and used for the 

 experiment. 



The latest contribution to the subject at this time 

 of writing is Dr. J. C. G. Ledingham's report (1910). 

 In an introduction to this report. Dr. Theodore Wilson 

 states that the difficulty of dealing with carriers is very 

 great indeed, since they may harbor the infection for 

 long periods and it is extremely difficult to free them 

 from it. It is most important, however, that all possi- 

 ble efforts should be made to detect carriers and to 

 endeavor to secure on their part those precautions of 

 strict personal cleanliness and of disposal of dejecta 

 which will minimize the risk of infecting other peo- 

 ple. Furthermore, Doctor Thompson points out that 

 it is equally important that an attempt should be 

 made to prevent such carriers from taking any part 

 in the milk trade or in the preparation or handling 

 of food. 



An excellent review of Dr. Ledingham's report by 

 Dr. R. M. Grimm will be found in Public Health Re- 

 ports xxvi, No. 4, March 17, 191 1. 



