2 THE CULTURE 



they were brought, fome timernufl be ne- 

 ceflary before their fibres can acquire a 

 facihty of contracting and extending with 

 fufiicient quicknefs to anfwer the fudden 

 changes of the weather. Thus we may 

 obferve, that the natives of England and 

 Ireland are not fo affefted by the variabi- 

 lity of our feafons, as thofe born under the 

 fleady cUmates of Italy and France : hence 

 alfo we can account why old perfons, 

 whofe fibres, by growing rigid, have loll 

 the power of adapting themfelves to the 

 fudden changes of the weather, are very 

 fenfibly affe61:ed by its variations. 



The confequence which I would draw 

 from the foregoing obfervations is, that it 

 cannot be expetied by us, that filkworm's 

 bred from eggs, imported recently from 

 Italy or France, can immediately thrive. 

 Thofe therefore who attempt the breeding 

 of filk worms here in England^ had better 

 raife their ftock from eggs which have, 

 for fome preceding generations, had their 

 original among us. 



With regard to our colonies on the conti- 

 nent oi America, filkworms might be rear'd 

 in them all to perfection, from Neio-England 

 to Georgia inclufive j for the mulberry-tree 



will 



