PREPACE, _ xi 
and afforded many valuable observations concern- 
ing the identity of several Swedish and English 
Species ;—the Rev. Samuel Dickenson, who. 
sent several curious observations on the difficult 
genus Agrostis;—Mr. James Dickson, who 
furnished many specimens and answered several 
queries respecting plants of the Cryptogamia class, 
in which he so particularly excels;—the Rey, 
Dr. GoopEnovex, who, in addition to his masterly 
elucidation of the genus Carex in the Trans. of 
the Linn. Society, sent several specimens of the 
rarer kinds,and ascertained several doubtful species 
both in that genus and also in the Fuci;—J. W. 
Grirritn, Esq. whose numerous and instructive 
specimens and observations have greatly enriched 
the catalogue of Mosses and Lichens;—Dr. 
Hope, whose specimens from his own collection, 
and from that of his late worthy father, the Pro- 
fessor of Botany at Edinburgh, have much contri- 
buted to elucidate the Flora of Scotland;—the 
Right Hon. Lady Elizabeth Norx, who furnished 
the first Byssus ever observed in fructification :— 
Dr. Putrenzy, whiose specimens and remarks 
assisted in correcting some mistakes respecting 
some of the plants in the Southern Counties ;— | 
Mr. Edward Roxzson, who has enriched the work 
with more new Species, and several valuable obser- 
_ vations on the Plants of the Northern Counties;— 
the Rev. Richard Rezwan, whose indefatigable 
tesearches have greatly increased the Catalogue of 
