LIVER FLUKE. 211 



known as the record of exhaustive as well as recent 

 observations, and also observations taken in this 

 country. Those who wish to study the subject in 

 detail are referred to works quoted at foot.* 



Amongst methods of prevention and remedy men- 

 tioned b}^ Prof. Thomas are the following : — 



" Care must be taken to avoid introducing eggs of 

 the Fluke, either with manure, or with fluked sheep, 

 or in any other way. Eabbits and hares must not be 

 allowed to introduce the eggs." 



" Dressings of lime, or salt, should be spread over 

 the ground at the proper seasons, to destroy the em- 

 bryos ; the cysts of the Fluke ; and also the Snail, 

 ■which acts as ' host.' " 



" Sheep must not be allowed to graze closely, for 

 the more closely they graze, the more Fluke germs 

 will they pick up." 



" When sheep are allowed to graze on dangerous 

 ground, they should have a daily allowance of salt, 

 and a little dry food." — (Page 304 of Keport previously 

 quoted in vol. xix. of Journal of Eoyal Ag. Society.) 



Amongst the details of treatment, of which the 

 above is an abstract, is the observation (j). 300) : — 

 " The freedom from rot of sheep feeding on salt 



* ' Eeports on Experiments on the development of the Liver Fluke, 

 Fasciola hcpatica,' by A. P. Thomas, F.L.S., &c., in vols. xvii. xviii. 

 and xix. of the ' Journal of the Koyal Agricultural Society of England,' 

 2nd series. 



The Life-history of the Liver Fluke is also given by the same ob- 

 server in the ' Quarterly Journal of Microscopical Science,' 1883, pp 

 99—133. 



The life-history, from personal observations by K. Leuckart, will be 

 found in ' Zooloj;ischer Auzieger,' Dec. 12th, 1881, and Oct. i)th, 1882 ; 

 and technical information regarding the development of the Trematoda 

 to which order of Vermes the Fluke belongs, will be found, with some 

 special observations on D. hepatiomi, in the ' Text-book of Zoology,' 

 by Glaus and Sedgwick, vol. i. pp. 311) — 322. 



A very serviceable account, for practical purjDoses, compiled from 

 various sources, will be found at pp.127 — 13-4 of 'Animal Parasites 

 of the Sheep,' by Cooper Curtice, D.V.S., M.D., publishel by the 

 U. S. Dept. of Agriculture. This account is mainly compiled from 

 various European authorities (duly acknowledged), the infestatiou 

 being comparatively unknown in the United States. 



