POSTSCRIPT. 
Is bringing my Work to a close, I have but to express my unaffected sense of its many defects, for which the 
rapidity of its execution, and my other occupations, are the only apologies I can offer. 
To those eminent men who have honoured me with their assistance during its progress, I wish again briefly to 
express my obligations, as its only permanent claims to distinction will rest upon their valuable contributions. 
To Robert Brown, Esq., whose acquirements in botanical science are only equalled by his profound philosophical 
sagacity and his unrivalled skill as a microscopical observer, I am indebted for several admirable elucidations of 
genera. The kind assistance, in resolving my doubts and correcting my errors, which he has liberally rendered on 
all occasions, and especially the friendship with which he has honoured me, claim from me the heartfelt expression 
of my deepest gratitude. 
To Professor Nees von Esenbeck, the learned President of the Academia Nature Curiosorum, I have to express my 
thanks for his most laborious and admirable monographs of Laurineæ and Acanthaceæ. 
To Professor von Martius, the worthy successor of Humboldt in the investigation of the natural history of South 
America, and equally in the splendour and interest of the works illustrative of his labours in that country, Í am in- 
debted for the monograph of the family of Restiaceæ, and the description and plates of two species of Eriocaulon 
and of Chamærops Martiana. 
To Professor Meisner I cordially acknowledge my obligations for his elaborate synopsis of Polygoneæ, and the 
drawing of Polygonum Emodi. ; 
To Professor Lindley, to whom I early expressed my thanks for his assistance in the general arrangement and exe- 
cution of this work, and which has been most promptly and lavishly extended to its close, I am especially indebted 
for various drawings and descriptions interspersed throughout it. 
To my most kind and esteemed friend George Bentham, Esq., I owe the synopsis of Labiatæ, a complete mono- 
graph of which family that excellent botanist is about to publish in a separate and more extended form. 
To Dr. Greville I am indebted for the beautiful drawings of Kaya floribunda and Indigofera Brunoniana ; and to 
Professor Graham (who has undertaken the difficult family of Leguminosæ,) for the description of the latter. 
To Francis Bauer, Esq., the skilful observer and unrivalled draughtsman, I have to express my best thanks for the 
analysis of Sphæropteris barbata. 
To William Griffith, Esq., who is at this moment on his voyage to India, and whose future exertions, if equal to 
the early display of his talents and zeal, will shed much additional light on the botany of that country, I owe the 
drawings of Humboldtia, Henslowia and Phytocrene,—the first published specimens of his botanical skill. 
Vor. III. b 
