200 . VI. PRINCIPLES OF 



cate*f*. RELIQUIA appears to be a more eligible 

 term, and is at once simple and comprehensive. 



The terms peirificata and conservata are to be 

 used only in reference to the modes of Reliquia, 

 not as systematic appellations, (v. . II. 1. 2.) 

 Names of the Orders, 



May conveniently be formed by that of the class 

 joined with terms distinctive of the originals as, 

 RELIQUIA Animalra RELIQUIA Vegetalia. 

 Mimes of the Genera. 



The name of a genus must form one word only f f 

 the generic names which have been given to i eli- 

 quia, forming two or more words, are therefore to 

 be rejected, e. g. Filix miner alls Lap. insect if eri 

 &c. 



extraneous fossils, it is the esssnfial form (. III. 33. p. 70.) 

 alone which distinguishes these bodies from minerals, for the 

 substance, even of the conservata (. II. p, 4. et 93. p. 135.) 

 differs only in its organic structure from mineral matter Form, 

 therefore, being the principle of their separation from other fos- 

 sils, it is form alone, which must be resorted to, for the founda- 

 tion of their arrangement under orders, genera, and species The 

 mode and substance of a reliquium produce merely accidental 

 distinctions. 



t It is not necessary to notice in this place the terms extraneous 

 fossils, jigurate fossils, secondary fossils, &c. as they are not 

 applicable to a systematic nomenclature, though sufficiently accu- 

 rate for general use. 



ft According to the Linnean Botanical canon " nomina gene- 

 rica ex duobus vocabulis integris ac distinctis facta, e Republic* 

 Botanica releganda sunl." Pliyl. Bot. p. l(>0. 



