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XX VI i I. An Account of the bnpreffions of 
Plants on the Slates of Coals : In a Letter 
to the Right Honourable George Earl of 
Macclesfield, P ref dent of the R. S. from 
Mr. Emanuel Mendes da Cofta, F. R. S 
My Lord, 
Read April 28, "y Have the honour to addrefs this let- 
I ter to your Lordfhip, in order to be 
communicated to the Royal Society, if your Lordfhip 
deems it worthy the attention of that learned and 
illuftrious affembly. 
The impreffions of various kinds of plants are 
frequently, I might fay always, found in fome of 
the flrata lying over coal ; but more particularly in a 
ftratum of earthy flat, which, in my Hijftory of Foffils, 
page 168. Species IV. I have fynonymed Schijius 
terrejlris niger carbonarius , and which always lies 
immediately upon the coal-ftratum, not only in the 
coal-pits of this kingdom, but of many other parts 
of Europe, e.g. France, Saxony, Bohemia, Silefia, 
&c. 
Moft of thefe impreffions, my Lord, are of the 
her bee capillar es et affine s, the gramineous, and 
the reed tribes : but, however, among them many 
rare and beautiful impreffions undoubtedly of ve- 
getable origin, and impreffed by plants hitherto un- 
known to botanifls, are not unfrequently met with. 
Befides thefe, my Lord, found over coal-pits, there 
are likewife found in fome parts of this kingdom, 
as at Robinhood’s-bay in Yorkfhire, Coalbrookdale 
in 
