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XVIII. Copy of Mr. Thorpe’s Letter to 
Dr. Diicarel, concerning Chef nut Lrees, 
Dear Sir, 
flead March S, T T A VI N G perufed the Hon. Mr. 
XTjL Barrington’s letter to Dr. Watfon, 
publilhed in the Philofophical Tranfadions, I find 
he lays down three or four general rules to determine 
whether a tree is indigenous or not in any country, 
as follows : 
** t. They mufi: grow in large mafies, and cover 
** confiderable trads of ground; nor mufi: fuch woods 
“ end abruptly by a hidden change to other trees, 
except the fuuation and ftrata become totally 
different. 
“ II, If the trees grow kindly in copfes, and 
** (hoots from the ftool, it mufi: for ever continue in 
“ fuch a wood, unlefs grubbed up, nor is it then 
“ eafily extirpated. 
“ III. The feed mufi ripen kindly ; nature never 
“ plants but where a fucceflion may be eafily con- 
“ tinued, and in the greatefi: profufion. 
“ Laftly, many places in every country mufi: re- 
ceive their appellation from indigenous trees, which 
“ grow there, 6cc. When the inftanccs of this are 
“ fingular. 
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