430 



THE GEOLOGIST. 



besides the division Peirograpliie in Professor Xaumann's Geognosie^'"- 

 Each of these works possesses characteristic excellences, and, taken 

 altogether, they may safely be considered to exhaust the subject. Por 

 theoretical views and general principles, I^aumann undoubtedly stands 

 first; Senft is the most elaborate, both in classification and descrip- 

 tion — sometimes too elaborate ; while Cotta is to be preferred by those 

 who require a practical description of individual rocks unincumbered 

 by endeavours after a perfect system of classification. 



YIII. YV ith such recent and elaborate works as these in existence from 

 the pens of men of such high scientific position, it would be the merest 

 folly to make any attempt at originality. My object, therefore, in these 

 papers will be merely to condense and arrange the most essential 

 portions of their information, embodying at the same time as much of 

 the labours of Bischof,j- Bunsen, Delesse, and others as may be neces- 

 sary to bring before the readers of the Geologist a complete view of 

 our present knowledge on this important branch of our great science. 



In carrying out this plan, I have divided the entire subject into four 

 leading divisions, as follows : — 



1. On the various chemical and mineral constituents of rocks, and 

 their general relations. 



2. On the structure, texture, and i^hysical characteristics of rocks. 



3. On the classification and description of rocks. 



4. On the origin and metamorphism of rocks. 



{To he continued.) 



THE COMPAEATIYE GEOLOGY OE HOTHAM, NEAE SOUTH 

 CAYE, YOEXSHIEE. 



I3y the Eev. T. W. Noewood, of Cheltenham. 



HoTHAM is a small village between the towns of South Cave and 

 Market Weighton, in the East Eiding of Yorkshire, situated upon the 

 Lower Lias formation, about five miles above where that zone crosses 

 the Ilumber at Y/hitton and Brough. 



* Naum iuin. — fjcJirhuch dcr Geo/jnosie. Leipsic, 1858. (New Edition). Yol. L, 

 pp. 381-77G. Ill Frcucli, I may refer to Professor Coquand's Traitc dci Roches. 

 (Paris, Bailliere, 1857), and D'Orbigny's article Jiochcs in the Bidionnaire 

 Universale d'JIistoire Naturclle. 



t Ekmmis of Chemk.U and rinjsiccd Geology. Translated by the Cavendish 

 Kocioty. Two Yoh. 



