420 
THE GEOtOGlST. 
besides the division reirograplde in Professor ISTaumann's Geognosie": 
Eacli of these works possesses characteristic escollcnces, and, taken 
altogether, they may safely be considered to exhaust tlie subject. For 
theoretical views and general principles, ITaumann 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. 
VIII. With 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,f 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 physical characteristics of rocks. 
3. On the classification and description of rocks. 
4. On the origin and metamorphism of rocks. 
(To he continued.) 
THE COMrAEATIVE GEOLOGY OE HOTHA.M, NEAR SOUTH 
CAVE, YOEXSHIEE. 
By the Eev. T. W. NovvWood, of Cheltenham. 
HoTHAM is a small village between the towns of South Cave and 
Market Vcighton, in the East Biding of Yorkshire, situated upon the 
Lower Lias formation, about five miles above where that zone crosses 
the Humber at Whitton and Brough. 
* Naumaun. — Lehrbuch dcr Geognosie. Lcipsic, 1858. (New Edition). Vol. I., 
pp. 381-77G. In Frcncli, I may refer to Professor Coquand's TmiU ties Rochea. 
(Paris, Bailliere, 1857), and D'Orbigny's article Roches in the Diciionnairc 
Universale d'llistoire Naturclle. 
t Elements of Chemic.ii and Physical Geology. Translated by tlic Cavendish 
Society. Two Vol's. 
