V1U CONTENTS. 



corallines, and sponges, explained, p. 103 134. Rottenstone in Derby- 

 shire,, produced by the disintegration of black limestone, p. 140. Petri- 

 factions common in chert, p. 142. -Woodstone, how distinguished by au- 

 thors, p. 143. Petrifactions in jasper, different opinions on. p. 144. 

 Petrifactions, agate, what. p. 144. Lehman's distinction of rocks best 

 suited to the present study, p. 156. --Distinction of transition rocks accord- 

 ing to Werner, p. 158. Alluvial rocks, observation on. p. 161. Granite 

 masses perhaps only detached parts of an immense stratum, p. 165.-- 

 IVtrified wood found in water, observation on. p. 169. Distinction be- 

 tween bed and stratum according to the Wernerian school, p. 170. Dip, 

 crop, stretch, &c. of a stratum, what. p. 171. Veins, division of, into rake 

 and pipe. p. 172. Ileliquia of veins sometimes the same as those in the 

 surrounding rocks, p. 173. Impression not a mode of petrifaction, p. 178. 



. IV. GEOGRAPHIC SITUATION of Reliquia. 



Particular . . } 



f what . page 181 

 General . C 



. V. PRINCIPLES OF ARRANGEMENT. 182-198 

 On what hitherto founded An Arrangement founded 



on that of the recent subjects, most eligihle. 183 

 Class, Order, Genus, what . . . - 114 



Natural Genera Artificial Genera, what . 185 

 Enumeration of Genera . . . . 1 86 

 Families, permanent, what . . . - 187 



, temporary, . . . . - 188 



Species, on what founded . . . 188 



Species, permanent, what . - 189 



Enumeration of the parts on which permanent species 



are to be founded .... 189-194 



Species, temporary, what . . . . - 194 



Enumeration, of the parts on which temporary species 



are to be founded .... 194-195 

 Species, temporary, not to be unnecessarily multi- 

 plied . .. . . . . 195 



