liu-e.<h'ii<(l!onfi in ISSS for ihc lioij'd A'jn'cnUural Socicfij. 327 
pai'ticularly uoticed that the rods, iuslead of being very abuu- 
dant, were sparsely scattered here and there, as shown in the 
woodcut Fig. 7, page o2G, 
Further experiments proved that swine can be infected with 
anthrax by eating the offal of animals dead of the disease, by 
injection of anthrax blood, and by inoculation with pui'e culti- 
vations of the anthrax bacillus. 
Farasltk Diseases. 
Cases of hydatids in the brain of sheep and strongles in the 
lungs of sheep and calves have afforded valuable opportunities 
of studying these diseases at the College. In regard to the 
brain liydatid, the life-history of the parasite has long been 
known. The bladder-worm in the brain which causes the 
giddiness and finally kills the infested sheep is the larval form 
of a tape-worm which infests the dog ; and when the mature 
segments of the worm are expelled from the intestines of the 
dog, they fall in the pastures and are taken up by the sheep. 
In a short time the embryos which are contained in the 
eggs in each mature segment find their way into the brain 
and become developed into hydatids. To prevent the disease, 
it is obvious that dogs which harbour tape-worms should l)n 
treated with the remedies which destroy those parasites ; and it 
is especially desirable that when the head of a " giddy " sheep is 
cut open by the butcher, and the hydatid taken out, it should 
be burnt or otherwise effectually destroyed, instead of being 
given to a dog, or left where one of those animals may seize and 
swallow it, and thus infect himself with tape-worms. 
Investigations into the life-history of the lung-worms of 
sheep and calves, for which a special grant of o^l. was made by 
the Society, have been carried on with very pi'omising results. 
It is yet too early to advance any conclusions, but it may safely 
be asserted that when the late Dr. Spencer Cobbold detected 
some embryos of the lung-worm in a sinall earth-worm which 
he found in the earth in which he had put eggs and embryos 
of the lung-strongle, he made a discovery which, if he had lived, 
he would have worked out. At the beginning of the present 
inquiry the line which Dr. Cobbold had indicated in his paper 
in the Society's Journal in 1886 (Part II.) was followed; and 
it was soon discovered that in the earthworms from fields in 
which animals affected with husk had grazed or were gi'aziug, 
embryos and larvas of strongles existed in great numbers. 
Some of the larvee had evidently undergone more than one 
change of skin, and in several the digestive system was well 
developed, and the generative system sufficiently advanced to 
