l^ra/isinissioii 



45 



of the disease and the passage of blood and other sympLonis may 

 be very short ; one patient, who stayed at an hotel at Suez for 

 fourteen days, suffering from them a month after his return to 

 Bombay." More extensive observations were made during the 

 South African War. Beveridge [24] gives the following valuable 

 table in the Journal of the Eoyal Army Medical Corps for 

 1907 :— 



In the same year Dr. Stock [475] wrote : " The time which 

 elapses between its entrance and the onset of symptoms seems to be 

 settled from the observations of Dr. Abercrombie. During the time 

 that the regiment was at Pretoria several young drafts were sent 

 out direct from England and all in due course bathed in the spruit, 

 and as a result several cases occurred in young soldiers whose 

 residence in the country had not been more than two months. 

 The shortest period observed was one month, and the longest 

 two months." 



A similar incubation period occurred in the monkeys infected by 

 us experimentally. Monkey No. 1, infected by immersion on June 15, 

 17, 24, and July 11, passed biiharzia eggs on August 4 and died on 

 August 18. Monkey No. 2, immersed on June 17, 20, 23, and 

 July 11, passed blood and mucus containing biiharzia eggs on 

 July 80 and died August 9. Monkey No. 3, immersed June 17, 

 20, 23, and July 11, showed biiharzia ova in the wall of the large 

 intestine after death on August 2. Monkey No. 4 drank infected 

 water June 24, and on other occasions, including July 11, passed 

 schistosome eggs and blood on August 4 and died of acute 

 bilharziosis on August 8. 



Occurrence of Bilharziosis in Large Towns. 

 There is one argument brought forward in his numerous papers 

 by Professor Looss which seems at first sight to lend real support 

 to his view that the mollusc is not required for the biiharzia 



