LIFE HISTORY OF THE LIVER-FLUKE. 133 



which have a branched digestive tract. It is usually supposed 

 that the liver-fluke passes out of the sheep at the beginning of 

 the summer, i.e., life lasts only about three quarters of a year. 

 But I have shown elsewhere ^ that the life of the liver-fluke 

 may extend beyond one year, and have found both digestive and 

 reproductive organ in full functional vigour in flukes at least 

 thirteen months old; the oviduct was filled with eggs, and 

 there was no indication of any exhaustion of the supply. 



For an account of the economic aspects of the subject, in- 

 cluding the discussion of preventive measures, I may refer to a 

 paper in the forthcoming number of the ' Journal of the Royal 

 Agricultural Society.' 



It gives me much pleasure to take this opportunity of thank- 

 ing Dr. Acland for kindly permitting me to use the Sanitary 

 Laboratory of the Oxford Museum for my experiments, and 

 Professor Moseley for kindly placing apparatus, &c.j in the 

 Anatomical Department at my disposal. 



> Ibid., p. 26. 



