286 APPENDIX. 



now made for the use of amateurs. In the case of exogenous woods, 

 three sections are necessary to exhibit the whole of the structures. 

 One of these should be transverse and two longitudinal, the latter in 

 radial and tangential planes. 



IV. GENERAL WORKS ON PAL^OBOTANY. 



IN the text frequent reference has been made to special memoirs 

 and reports on the fossil plants of particular regions or formations. 

 There are, however, some general books, useful to students, which 

 may be mentioned here. Perhaps the most important is Schimper's 

 " Traite de Paleontologie Vegetale." Very useful information is 

 also contained in Renault's " Cours de Botanique Fossile," and in 

 Balfour's " Introduction to Palaeontological Botany," and Nichol- 

 son's " Palaeontology." Unger's " Genera et Species," Brongniart's 

 " Histoire des Vegetaux Fossiles," and Lindley and Hutton's " Fossil 

 Flora," are older though very valuable works. Williamson's " Me- 

 moirs," in the " Philosophical Transactions," have greatly advanced 

 our knowledge of the structures of Palaeozoic plants. Lastly, the 

 " Palaeophytology " of Schenk, now in course of publication in Ger- 

 man and French, in connection with Zittel's " Palaeontology," is an 

 important addition to manuals of the subject. 



