240 Notices respecting New Boohs. 



criticisms or other observations on the papers are entirely sepa- 

 rated from, the abstracts ; the few notes that will be found amongst 

 the latter being designed only to render the author's meaning 

 clear, or to point out the bearing of the statements he makes, by 

 comparison with the statements of others on the same point .... 

 The real criticisms or discussions of the subjects are collected 

 together in the form of an Introductory Review " (pp. i-xliv) ; 

 and this is of considerable interest as an excellent resume of the 

 newest and most important facts and opinions in Geology, so far as 

 last year is concerned. Under General Geology in this "Review" 

 (the papers and books are enumerated, with their abstracts, pp. 1- 

 32) are included — the Earth's density and the condition of the 

 Earth's Interior (pp. i-ix), organic agencies and subterranean 

 erosion (p. ix), earth-folds and the age of folds (pp. x & xi), 

 oceanic deposits (p. xi), and some faults (p. xii). Under Strati- 

 graphical Geology (for papers &c, see pp. 32-122) we have 

 remarks on the Archaean, the Torridian, the Cambrian or Monian 

 in Shropshire, Cambrian in North "Wales, and the Olenellus-zone 

 (pp. xi-xiv), Devonian, Culm-measures, Permian and Trias, and 

 Bunter pebbles (pp. xiv-xvi), Lias, Jurassic, and Speeton Clay 

 (pp. xvi-xix), the Bagshots, Glacial gravels and Boulder-clay, and 

 Rubble-drift (pp. xix-xxi), Ice in the English Channel and date 

 and causes of the Glacial Period (pp. xxi-xxiv), the boring at 

 Dover, and evidences of depression derived from borings (pp. xxiv- 

 xxvii). 



Under Palaeontology (papers &c, pp. 127-184) — Human Imple-. 

 ments, fossil reptiles, fossil fishes, cephalopoda, gasteropoda, insects, 

 trilobites, and foraminifera (pp. xxvii-xxxii). Under Palaeobotany 

 (papers &c, pp. 184-195) — the Devonian flora, Stigmaria, Carboni- 

 ferous Equisetum, and plant -remains in igneous rocks (pp. xxxii- 

 xxxiv). 



Under Mineralogy and Petrology (papers &c, pp. 195-231) — 

 the sequence of plutonic rocks, Dartmoor granite, quartz in basic 

 rocks, age of crystalline schists, schists of the Lizard, of Malvern, 

 and of Sark (pp. xxxiv-xxxix), rutile in clay-slate, and quartz- 

 knobs and quartzite (pp. xl-xlii). 



The papers and reports on Economics (minerals, coals, building- 

 stones, and water-supply) are enumerated at pp. 231-247 ; maps 

 and sections, p. xlii and pp. 247-257. Eoreign geology, described 

 and illustrated in Britain, is treated at pp. xlii-xliv ; and under 

 successive appropriate headings at pp. 259-301. 



The numerous illustrations, comprising some diagrams and 

 plans, some sections, and many figures of fossils, carefully repro- 

 duced from photographs, engravings, woodcuts, &c, by permission 

 of Authors and Societies, are far more satisfactory than the plates 

 of well-intended, but poor, outline figures in last year's \olume. 

 The favourable chance, however, of borrowing big photographs or 

 cuts has tempted the author here and there to lavish some extra 

 pages and even leaves on pretentious objects. 



Great labour and expense have been spent on this work by its 



