ON THE PROPAGATION OF ROT IN SHEEP. 
9 (> 
deposits eggs ; of which I have collected many millions in the 
following manner : — 
In the month of April, May, or June, obtain the whole abdo- 
minal viscera of the diseased sheep. In the first place, with a 
bit of good stout thread, tie the ductus communis, or pipe of the 
gall-bladder, as nearly as possible to the duodenum, — the gut 
into which the gall is emptied. The opening of the pipe of the 
gall-bladder will be found along the gut about eleven or twelve 
fingers’ breadth below the pylorus, or the opening of the stomach 
into the gut. Having secured the pipe of the gall-bladder by 
ligature, next dissect out the liver, without wounding its sub- 
stance, from the rest of the viscera; wash it, and place it in a 
clean hand-basin. 
The flukes and their eggs are never in the “ arteries” or veins 
of the liver; it is in the gall-bladder, choledoch, cystic, and 
hepatic ducts, and in all the larger biliary tubes of the liver, that 
they are found ; but even in the vena portae, which carry venous 
blood, returning from the intestines in a state ready to yield bile, 
they are not found. 
Having the detached, clean-washed, liver of a diseased sheep 
in a hand-basin, with a pair of scissors slit up the gall-bladder, 
and the large biliary tubes of the liver ; collect their contents, 
consisting of gall, flukes, and eggs, in a large clean tumbler. 
The inside of the gall-bladder, especially near to the pipe, where 
egg s abound, may be slightly scraped, and the bilious mucus 
thus collected may be added to the other contents of the tumbler. 
Then pour in some very pure pump water, which, after the flukes 
have been viewed, may be taken out and thrown away. Any 
floating mucus, or any foreign substance that accident may have 
introduced, may also be taken out and thrown away. There will 
now be left in the glass a solution of gall, containing hundreds 
and thousands of flukes’ eggs. If this solution be sufficiently 
diluted with clean water, the soundest and most perfect eggs will 
settle at the bottom : this phenomenon will be best perceived in 
an ale glass tapering to the bottom ; upon the sloping sides of 
which the eggs will settle, and whence they may be caused to 
roll down over one another to the bottom by any slight jar given 
to the glass on its outside. To the unassisted eyes these eggs 
appear to be fine, regularly shaped, equal sized grains of reddish 
sand. At the surface of the solution, especially near the sides 
of the glass, hang multitudes of eggs also ; but these floating 
eggs are mostly ill-shaped, most probably in an advanced state 
towards maturity, or ready to hatch, some evidently ruptured, 
and probably many addled. 
If to collect sound eggs be the object, pour away with a steady 
hand the bulk of the fluid, leaving about one-tenth with the un- 
