C '58 ] 



to the rearing this kind of (lock. And we fhall 

 fbon fee that nature has not been lefs liberal in pro- 

 viding the means for improving the quality of the 

 -^Qoly fuppofing it was not originally Jo fine as we wiped 

 it to be. To underlland this laft particular fully, 

 the following fad muft be efpecially adverted to: 



It is a fa6l well known, and confirmed by daily 

 experience, that every diftin^ breed ofjheep^ whatever 

 qualities it may fojfefsy continues to propagate its own 

 kind without any permanent variation as long as it is 

 kept from inter copulating with other breeds ofjheep: 

 But if different breeds be Juffered to inter copulate^ a 

 mongrel breed is produced^ which participates of the 

 nature of both the parent s^ without poffeffing in full per - 

 fe^ion the qualities of either, 'This mongrel breed may 

 be in like manner again farther altered^ by being mixed 

 with other breeds -y and Jo on in infinitum.* 



adly. By attending to this fadt we fliall be able 

 to perceive in what refp'e(fl human induftry requires 

 to be exerted in improving the quality of the wool 

 of any particular diftridt, and be made fenfible that 

 if this be negledled, whatever the nature of the cli^ 

 mate may bCy it is fcarcely poffible but that the qua- 

 lity of the wool produced there, if it has been fine 



• See this fadl alfo proved, in oppofition to the do<5lrine of M. 

 Buffoa on this fubjetSl. Obfervations on National Induftry, Let. VII. 



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