XXVll 



British Flora : comprising the Phaenogaraous or Flowering Plants, and the Ferns. 

 The Sixth Edition, with Additions and Corrections, and numerous Figures ilhis- 

 trative of the Umbelliferous Plants, the Composite Plants, the Grasses, and the 

 Ferns. By Sir William Jackson Hooker, K.H., LL.D., F.R.A. and L.S., Vice- 

 President of the Linnean Society and Director of the Royal Botanic Gardens of 

 Kew ; and George A. Walker- Arnott, LL.D., F.L.S. and R.S.E., and Regius 

 Professor of Botany in the University of Glasgow. London : Longman and Co. 

 1850 - 170 



Analytical Sanitary Commission ..... .... 195 



Species Filicum ; being Descriptions of all known Ferns. Illustrated with Plates. 

 By Sir William Jackson Hooker, K.H., LL.D., F.R.A. and L.S., &c., Vice-Presi- 

 dent of the Linnean Society of London, and Director of the Royal Botanic Gar- 

 dens of Kew. Part V. or Vol. II. Part I. London : William Pamplin, 45, Frith 

 Street, Soho Square. 1851 ......... 259 



Observations on Natural Systems of Botany. By James L. Drummond, M.D, Pro- 

 fessor of Anatomy and Physiology in the Royal Belfast Institution, Author of 

 ' First Steps to Botany,' ' Letters to a Young Naturalist,' ' First Steps to Ana- 

 tomy,' "Sec. London: Longman & Co. 1849 313 



Transactions of the Linnean Society of London. Volume XX. Part the Third. 

 London : Longman. 1851 263 



Popular Nomenclature of the American Flora. By Berthold Seemann. Hannover : 

 1851 353 



EXTRACTS. 



On the Development of the Spores and Elaters of Marchantia polymorpha. By Ar- 

 thur Henfrey, F.L.S. (From the ' Proceedings of the Linnean Society.) . 23 



Ripe Seeds of Cycadeae produced without Impregnation. (Id.). , . .26 



Affinities of the Family of Triuridaceae. By John Miers, F.Ii.S. (Id). . 26 



A Letter dated May 19, 1845, addressed by the President to Admiral Sir Francis 

 Beaufort, for communication to Baron Alexander von Humboldt, on the Origin 

 and Mode of Propagation of the Gulf-weed. (Id.) 28 



Notes on the Dry-rot, as observed in the Church of King's Wear, Devonshire, by A. 

 Holdsworth. (Id.) 30 



Notice of a peculiar Structure of the Cells on the Surface of Callitriche verna. By 

 E. Lankesler, M.D., F.R.S., F.L.S. (Id.) 32 



Observations on the Botany of Texas. By VVm. BoUaert, F.R.G.S. (Id.) . 200 



Summary of some of the principal Results of the Investigations into the Vegetation 

 of the Alps in connexion with Height and Temperature. By Dr. Adolph Schlag- 

 intweit. (Id.) 201 



Memoir on the Position of the Carpels when Two and when Single, including Out- 

 lines of a new method of Arrangement of the Orders of Exogens, and Observa- 

 tions on the Structure of Ovaries consisting of a single Carpel. By Benj. Clarke, 

 Esq. (Id.) • . .204 



On the various Forms of Salicornia. By Joseph Woods, Esq., F.L.S. : with some 

 additional remarks bj Richard Kippist, Esq., Libr. L.S. (Id.) . . , 208 



Cultivation of Ervum Lens in Scotland. (From ' Summer Life on Land and Water 

 at South Queensferry, by W. W. Fyfe.') 308 



