work, lie infiniiates fome doubts relating to 
the method fiiggefted by Petiver, and 
others, of deducing the qualities of vege- 
tables, from the agreement in natural cha- 
rafters ; and inftances the Cynogkjum^ as 
tending to prove the fallacy of this rule. 
He relates feveral infiances of the poifonous 
effefts of plants ; and thinks the Ecbium 
Marimim fPtdmonaria Maritima Lin,) 
iliould be ranked in the genus Cynoglojfmn^ 
fmce it pofleiles a narcotic power. He 
defcribes, and figures, feveral of the more 
rare Biiiifo plants, v/hich he had difcover- 
ed in a tour made into Wales, g. The 
Rumex Digynus : Lobelia Doj'tmaiina : AUf- 
nia Ranunculoides : Pyrola Rotundifolm : AU 
chemilla Alpina^ &c. 
But the work by which Dr. Blair ren- 
dered the greateft fervice to botany, origi- 
nated with his Difcourfe on the Sexes of 
Plants," read before th^ Royal Society, 
and afterwards greatly amplified, and pub- 
lilhed, at the requell: of feveral members of 
that body, under the title of, 
BoTANicK Essays. 1720. 8*. pp. 414. 
with four copper-opiates. This treatife is 
K, 4 divided 
