[ sop 1 
IV. Part of a Letter from Mr Antony 'Vm Lccu- 
wenhoekj concerning the Worms in Sheeps 
Livers^ Gnats^ and Aninialcula in tj^e Ex^ 
crements of Frogs. 
I Have thought fit to conflder of the Animals, our But- 
chers call Maggots, which often are found in the 
Livers of Sheep, when we have wet Summers, 
r When the Sheep have filled themfelves with Water 
wherein thefe Animals were , they being carried 
with their food, out of the ftomach into the beginning 
of the guts, where the bladder of gall doth empty 
itfelf, thefe animals being pleafed with the tafte 
of the gall, fwim againft it into the bladder of 
gall, and from thence go on into the veffels (hke veins 
and arteriesj of the gall y for when, a good while ago, 
I did fearch the liver of a Sheep, in the veiTels where- 
of were many of thefe animals, and did open a nodous 
part of the liver, I did fetch out of a gall veffel one 
of thefe animals, which was twice as long in the vein; 
and was indifferent fmalb 
When I had difcovered this, I did fancy that the 
worm had forced herfelf into the fmall veflel, fo that 
it could not get back again, and therefore did dye; 
which had firft caufed a corruption in that part 5 and 
fecondly, the vein being ftopt up by the worm did caufe 
a fecond putrififtion and matten 
To difcover ( if poffible ) the faid animals in the 
water, Tdid go in Auguji in the year 1658 into feve* 
ml pafture grounds about this City, where Sheep did 
feed -that were troubled with thefe difeafes, and th^re 
Illiad fome water taken up in a clear Glafs out of the 
ditches 
