334 BOARD OF AGRICULTURE. 
_ occupied by sheep or by older cattle or horses. Lambs may be 
safely grazed after horses or cattle, or foals and calves after 
sheep, but no young animal in such place should be allowed 
to graze after any creature liable to harbor the specific para- 
site, to whose attack its lungs are obnoxious. 2d. Overstock- 
ing should be avoided. If the parasite is introduced on any 
pasture, the facilities for its increase will be in exact propor- 
tion to the number of animals present in whose lungs it can 
attain full sexual development and reproduce its kind. 
3d. Thorough drainage will go far to prevent wt. As the young 
worms must live in water or in moist earth, the. facilities for 
their preservation will be increased according to the springy 
or marshy nature of the soil. 4th. Young stock must not be 
allowed access to water coming from a field containing beasts 
infested with itsown pulmonary parasite. Sth. Pastures or water 
in which any particular pulmonary parasite has gained a footing 
should be denied to all animals known to harbor that particu- 
lar parasite, or still better, the soil may be torn up with the 
plough and subjected to a rotation of other crops until time 
has been allowed for the destruction of the germs. 6th. No 
affected or suspected animal should be placed with others, nor 
in their pastures, until time has been allowed and measures 
taken to rid it of the unwelcome visitant. 7th. Feeding young 
animals on grass wet with dew, or on clover or other such 
fodder as affords by its abundant moisture a suitable nidus for 
the young worms, is to be avoided. 8th. Carcases of those 
dying of the affection should be deeply buried. 
The testimony of English farmers is strongly against second 
crop grass, and above all, clover which has been fed off with 
sheep or beef cattle, as the case may be, in the spring; and 
that eminent Prussian breeder, Baron Von Nathunsius, Hun- 
disburg, Magdeburg, asserts that though the /ilarza in lambs 
was formerly very frequent and pernicious in his neighbor- 
hood, he has not observed it for twenty years, since they took 
to feeding the lambs in sheds, on hay and roots, during the 
wet season. 
Under the second head, that of enabling the animal to resist 
the worms and their effects, may be mentioned: Ist. The 
