Tjcf'i. '{fftptove^khitd/ Jhegp ak^ tubal. i^ 



Seece of its progeny. Men cannot think With tab 

 much ptecision an subjects of this natui'e, I ihall 

 therefore explain myself. 



" By tny esperiraents it appears to be iindetiia|hl^, 

 ^at that part of every separate filament tof •wool 

 •which grows during, the warm season of the year, is 

 Toarser than that part of the same filament which' 

 ^rows during cold weather ; and that the variatioa 

 in this respect Will be proportioned to the diiFereftCfe 

 between the heat of these seasons. It has also been 

 "ascertained, by many esperiments: made by others, 

 that if a (heep be carried from a cold climate to onfe 

 ■which is greatly Warmer, it not only produces wool 

 bf a coarser filament than Taefore, but it also produces 

 a fleece much thinner in the pil^ than formerly.. The 

 joints that I had no opportunity of ascertaining^ are 

 the following, viz. first. Supposing the individual ani- 

 Itial had been kept some years in a warm cliifiate,. 

 and then were brought back to its- original climate, 

 would it again produce a fleece after that, as fine and 

 as close, as the same fheep would haVe done if it had 

 Trerer changed its climate ? Or, would it have had 

 its constitution so altered, as never more to produce 

 "as fine wool as before ? This is what I meant above 

 ty the pl.ras:e permanency of effect of climate on the 

 animal itself. Ot-, Secondly, supposing a breed of 

 Iheep had been carried into a warm climate from a 

 cold one ; and there allo'.ved to procreate for several 

 generations, withou.! intermixture with any othet 

 breed ; and (hould some of these desceiidafits be agaih 

 brought back to the ptee from v^hence they ori- 

 ginally set o*it, veoiild thes'e (beep, x^^vs brouglut 



