334 BOARD OF AGRICULTURE. 



occupied hy sheep or hy 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 he 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 pr event it. 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 its own pulmonary parasite. 5th. 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 Yon Nathunsius, Hun- 

 disburg, Magdeburg, asserts that though the filaria 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 : 1st. The 



