ADVERTISEMENT. 



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TO those Gentlemen who have so kindly fevoured me with information on the subieot. 



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acknowledmnents are due 



In particular, my best 



To Sir Hnmphry Davy, for his very kind and liberal assistance in furnishing the simple 

 chemical process, from which I derived confidence to attempt to realize the idea first suo- 

 gested by His Grace the Duke of Bedford, of ascertaining the nutritive powers of t^e different" 

 grasses, by the aids of chemistry ; and from the admirable simplicity of his details of the pro 

 cess for analyzing soils, and vegetable substances, given in his important w^ork on Agricultural 

 Chemistry, I have been enabled to execute this difficult part of the enquiry '^ 



To Thomas Greg, Esc|. of Coles, for many valuable communications on the most important 

 practica parts of the Work ; and his kindness on every occasion of enquiry on the subject of it 

 To James Sowerby, Esq. F.L.S. for his assistance in promoting the knowledge of the dif 

 ferei^ agricultural earths, by undertaking to supply those Gentlemen who are interested in the 

 enquny, with cabinet specimens of the whole of the different soils employed in this series of 



exnerimpnta ^ ui 



experiments. 



Wilson, of the Park Farm, W^ 



useful practical information, which he could so well supply. 



To Mr. Thomas Gibbs, Seedsman to the Board of Agriculture, I am indebted for information 

 respecting those plants more recently introduced to the Agriculturist, and which I could not 

 otherwise have obtained;-foracollectionofthedifrerent soils in the vicinity of London, with 

 their loca names; and for his w^illingness on all occasions, to communicate useful information 



on the snnif^pt nf iha. .^M^oor,^^ 



on the subject of the grasses. 



Where information has been derive.! from books, the authorities, in every instance, it is 



even art^ fvi^r«n '' 



believed, are myen. 



For reference to descriptions of the diflerent grasses and other plants, upon which experi- 

 nients have here been made, in those works which contain descriptions only, or descriptions and 

 figures of them likewise, the following abbreviations have been employed. 



AlUon. Fedcm. 



Car. Alllonii Flora Pedemontana, loml 3, Augusta Tauninorum, 1785, fol. 



Bank. Tin.. Casp. Bauhini Pina. Theatri Botanicl, Basilia., I67I, ^to. 



Cavanill Hisp. Ant. Jos. Cavauilles Trnnp« of p» ■ .• -n, 



, . , . , , ^*''*''^' ^t Descnptiones Plantarum, quae aut sponte in Hispania crescunt, aut in 



hortis bospitantur, vol. 6, Martiti, 1791-1801, fol. 



Curtis, or Flo. Lond. Plora Londinensis, by William Curtis, . vols. London, 1798, fol. 

 - Bn,L Bot. English Botany, by Sir J. E. Smith, P. L. S. the Figures by James Sowerby, Esq. F. L. S 



-F/o. Ger 

 Flo. Brltan, 



Flora Gem,a„ica, Autore Henrico Adolpho Scfarader, torn. 1, cum Tablulis vi. Aeneis, Gotting^, ISOb', 

 Flora Britannica, Autore Jac. Edv. Smith, vol. 1-3, London, 1804-1806, 4to. 



^lo. Ban. Icones Plantarum, &c. Hafnia., 1761, seqq. fol. 



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