C 2 1 3 ] 
neceffity of a more accurate and complete hifcory of 
this kind ; I have been frequently anfwered, that they 
defpaired of making any material additions to the 
difcoveries of Ray and other naturalifls, who have 
been in many parts of this country. 
_ ^ vei 7 ^ ru e that Ray and fome of his contempora- 
ries were in many of the Welfli counties; it appears, 
however, by his Journal lately publifhed, that he 
flayed but a very fhort time at any place, and only 
went to the top of fome of the high mountains. 
Now, Sir , 1 need not fay, to a perfon of your con- 
fummate knowledge in botany, that to difcover all the 
plants of a country, one fhould. at leaff, once a fort- 
night, fearch every part, from the time vege- 
tation commences, to that period of the autumn 
when it ceafes. He who fearches for pilewort in. 
July, without knowing that it is a plant, which appears 
early in the fpring, and that both leaves and flowers 
immediately afterwards decay, will fearch in vain t. 
the botaniff muff look for it in april, or not at all. 
Dillenius is the lateff botaniff of reputation, who 
hath vifited thefe mountains ; as 1 remember to 
have feen him a year or two before his death, I can 
venture to fay that thofe who may afterwards make 
toe fame fearch, need not abfolutely defpair of new 
and material difcoveries, notwithstanding his known 
diligence and accuracy. 
He was of a very improper make for clambering 
up a rock, or mountain; and indeedit is a misfortune 
to the naturaliff, that when from experience his 
knowledge . becomes confiderable, his ftreugth and 
activity begin to fail. 
Wheii 
