3^29 
GEOLOGICAL MODELS. 
Mr. SopwiTH next exhibited and explained a series of geo- 
logical models, which he has recently constructed for the pur- 
pose of facilitating the study of geology, and the nature of 
several phenomena which cannot be clearly understood with- 
out having recourse to solid forms, capable of being dissected 
and re-arranged in conformity with the existing types in 
nature which they represent. Owing to the length of the 
previous discussions, Mr. Sopwith's explanation of these 
models was not commenced until the hour of adjournment 
had arrived, and many persons were on the point of depar- 
ture; it was therefore in a great measure confined to answer- 
ing the inquiries of the noble Chairman, and to a brief 
description of the models given to his Lordship and a few 
members who remained. In consequence of the interest then 
expressed, Mr. Sopwith intimated his willingness to bring 
them forward the next time he should have the pleasure of 
attending one of the meetings of the Society. For the pre- 
sent, it may therefore suffice to say, that these models, twelve 
in number, were selected by Dr. Buckland from a series of 
models constructed by Mr. Sopwith, being such as that 
eminent geologist considered best adapted for the general 
student. They consist of nearly six hundred separate pieces 
of wood, fitted together so as to represent various conditions 
of strata — the effects of denudation, the displacement of 
strata by faults or dislocations, and the peculiar effects pro- 
duced in valleys by the relative steepness of strata, as com- 
pared with that of the surface. Engravings of three of these 
models may be seen in the last edition of Ly ell's Elements 
of Geology," and sets of them have been prepared for sale, 
the particulars of which may be obtained on application to 
Mr. Sopwith, Newcastle, or to his agent in London, Mr. 
Tennant, 149, Strand. Of the utility of such models as 
lessons in geology, a high opinion ha? been given in Dr. 
