200 
THE GEOLOGIST. 
with veins of granite and porphyry, termed " elvans," &c. In the valleys 
towards tlie sea are often thick accumulations of gravel and other alluvial 
matters, witli peaty deposits, from whicli stream-tin is obtained. Round about 
Truro tiic schistose rocks prevail. The Deadman is composed of slate-rock, 
supposed to be of Lower Silurian age, whicii reaches up to Pentuan, and yields 
a few fossils at Great Peraver, north of Gorran Haven. The quartz-rock of 
the Great Carn yields also a few fossils, and some have been found at Porth 
Caerhays. The fossils are chiefly Orthis and Trilobites. 
REVIEWS. 
Ihjy of Skipton. By T. Cueley, C.E., F.G.S. 1860. 
We have on a former occasion noticed one of Mr. Curley's local maps, and 
we are glad to find that he continues to append sections and details of geolo- 
gical phenomena exposed in the works of wliich he has the direction. The 
present map has been executed for the local Board of Health of Skipton ; and 
sliows the lines of the new sewers and the position of the new water reservoir 
and filter beds. The principal geological section given is along the line of 
the main sewer, through the Castle to Storem's Lathe, showing the carboni- 
ferous Limestone with its anticlinal axis and the superficial gravels, sands, and 
alluvial deposits. 
Amongst the numerous other sections exposed in the works in various other 
streets and roads, we notice the occurrence of mammalian bones in peat, below 
gravel, in that of Water-street ; of a shell-marl containing Phi/sa fontanis in 
that of Thanet-street ; and a gravel containing boulders, some as much as three 
and a-quarter tons in weight, in that of Newmarket-street. 
The map is very nicely and carefully executed ; and the geological details, 
from their reliableness, render it a valuable record of the local stratigraphical 
conditions. 
A Comparative View of the Unman and Animal Frame. By B. Waterhouse 
Hawkins, F.L.S., E.G.S. London : Chapman and HaU. 1860. 
The object of this work is to give a comparative view of the variations in 
form of the bony skeleton or framework of those animals most frequently re- 
quired by the artist, designer, or ornamentist ; and most admirably, by judicious 
arrangement and skilfulness of delineation is this end attained. Whether we 
wish to compare vertebral columns, ribs, arms and fore-limbs, legs and hind- 
limbs, or to study any individual or particular bones, in these plates we have at 
once not only faithful portraits of the objects, but we find the attitudes of the 
figures so thoughtfully posed, that we can carry the comparison at once even 
to the different actions these bones or parts are subjected to in the different 
animals by similar movements. They show, too, more completely than any 
plates we can remember to have seen, the true archetypal plan of the vertebrate 
skeleton and the subservient modifications it has undergone in its adaptation to 
the wants and requirements of the various grades and classes of animals. 
