374 Reviews — T. IT. Hall's Geology of Devonshire. 



publishing what has evidently been a labour of love, though beset 

 with difficulties. 



In the chapter devoted to the physical properties of crystals, a 

 part needs careful revision by the author before its republication ; 

 no doubt, had Mr. Milne been in England, and able to consult 

 authorities, this would have been more carefully treated. Of course 

 Mr. Milne's notes are printed verbatim, the Editor not altering the 

 author's work at all, save in a few trivial instances. 



The woodcut figures are clear, and exceedingly well chosen. 



As to the rest we consider that Mr. Milne has displayed con- 

 siderable ingenuity in putting before his students in the way he 

 has done a confessedly difficult subject, but into which those not 

 versed in higher mathematics may yet hope to gain a fair insight. 



The work has been seen through the press by Mr. Thomas 

 Davies, F.G.S., who for twenty-one years has been attached to the 

 Mineralogical Department of the British Museum, and is so well 

 known to all penologists and mineralogists on account of his 

 intimate knowledge of these sciences. 



II. — Syllabus of a Course of Lectures on Geology. (Cambridge 

 University Extension.) 1873 to 1877. By W. J. Sollas, M.A., 

 F.G.S. 8vo. (London, 1878.) 



THESE Heads of Lectures will be very useful to students and 

 teachers, as they are full and suggestive, and contain references 

 to the principal works on each subject. The lectures embrace some 

 matters more or less distinct from Geology proper, as those on the 

 Atmosphere, Bain, and Snow; but it is not difficult to see their 

 bearings on Geology, as also those of Astronomy, when we come to 

 discuss the Evolution of the Earth. In this respect the series of 

 lectures takes in a general scientific course, such as would be 

 included in Fhysiography. A prominent feature is the attention 

 given to the physical geography of past periods. The Permian beds, 

 we may mention, are grouped with the Mesozoic rocks ; and the 

 Cambrian rocks are arranged according to the classification of 

 Sedgwick. H. B. W. 



III. — A Sketch of the Geology of Devonshire. By Townshend 

 M. Hall, F.G.S. [Eeprinted from "White's History, Gazetteer, 

 and Directory of the County.] 8vo. (Sheffield, 1878.) 



IN the closely-printed seventeen pages of this sketch, Mr. Hall 

 has given a very clear and condensed account of the Geology 

 of Devon. The Devonian and Carboniferous rocks, which together 

 occupy nearly two-thirds of the superficial area of the county, 

 naturally receive a considerable share of attention, and the lists of 

 fossils most commonly met with in their main divisions form a 

 particularly valuable feature of this work. 



The Triassic rocks, with their fossiliferous Budleigh pebbles, 

 receive due attention ; so also do the Cretaceous, Miocene, and Post- 

 Tertiary deposits, including with the latter the Cave remains, the 



