200 



THE GEOLOGIST. 



with veins of granite and porphyry, termed " elvans/' &g. In the valle;^s 

 towards the sea are often thick accumulations of gravel and other alluvial 

 matters, with peaty deposits, from which stream-tin is obtained. Round about 

 Truro the schistose rocks prevail. The Deadman is composed of slate-rock, 

 supposed to be of Lower Silurian age, which 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 TrUobites. 



EEYIEWS. 



Map of SMpfon. By T. Cueley, C.E., P.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 which he has the direction. The 

 present map has been executed for the local Board of Health of Skipton ; and 

 shows 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 Thysa 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 stratigrapliical 

 conditions. 



A Comparative View of the Human and Animal Frame. By B. Wateehouse 

 Hawkins, P.L.S., P.G.S. London : Chapman and Hall. 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 ornaraentist ; and most admirably, by judicious 

 arrangement and skilfulness of delineation is this end attained. Whether we 

 wisli 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 thoughtfidly posed, that we can carry the comparison at once even 

 to the diiferent actions these bones or parts are subjected to in tlie 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 

 skch>l on and the subservient modifications it has undergone in its adaptation to 

 the wauls and requirements of the various grades and classes of animals. 



