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are further particularly desired to attend the examinations which 
are held at stated intervals during the course. 
Demonstrations . — As the relative age and sequence of geolo- 
gical formations are to a great extent determined by the evidence 
afforded by the Fossils they contain, and since, for this reason, a 
practical acquaintance with those organic remains, which charac- 
terize particular formations, is of the utmost importance to the 
geologist, the Lectures on Natural History are supplemented 
by a series of demonstrations of such characteristic fossils: 
these are given in the Museum, by Mr. Salter and Mr. Etheridge, 
to students who have already attended the Lectures on Natural 
History. 
Mineralogy. 
The lectures, which will be illustrated by specimens intended 
for close inspection, comprise : — 
I. Crystallography, treated as an introduction to the science ; 
showing the leading classification of the crystalline forms, the laws 
by which their variations are determined, and their combinations, 
all considered with reference to the forms actually met with 
among crystallized substances. 
II. The physical properties of minerals, viewed principally 
as aiding in the practical discrimination of the various species. 
III. The elements of the chemistry of Mineralogy, with the 
use of the blow-pipe, and of such tests as are calculated to be 
serviceable to the miner, the geologist, the scientific traveller, or 
the general observer when in the field. 
IV. The physiography or systematic description of minerals, 
including all the more important species and varieties, with par- 
ticular reference to the mode and places of occurrence, both of 
those substances which bear a commercial value, and of those 
which derive their chief interest from geological and physical 
considerations. 
Geology. 
The first part of this course embraces the geological processes 
now in action on the surface and in the interior of the earth, 
an account of the more important mineral substances entering 
into the composition of rocks, together with an explanation 
