166 Reviews — Prof.Preshukh on Water-Supply. 



Fig. 31. — Scraper (p. 40, op. cit.). 



32. — Arrow-liead with notches (p. 34, op. cit.). 



33. — Broken spear-head, ornamented (p. 35, op. cit.). 



34. — Bone arrow-head (p. 34). 



35. — Bone harpoon (p. 38). 



36. — Broken spear, or arrow-head (p. 35). 



37. — Perforated Ammonite (p. 45), 



38, 39, 40. — Ornaments of stone (p. 41). 



41. — Broken baton (?) with two perforations (p. 46). 



42. — Ornamented hilt of poniard (?) (p. 43). 



II. — Guide to the Geology of London and its Neighbourhood. By 

 W. Whitaker, B.A., r.G.S. Second Edition. (London, 1875.) 



THE popularity of this excellent Guide to London Geologj'' is fully 

 proved by the fact that a second edition has been called for in 

 less than three months from its publication. The only material dif- 

 ference between the two editions consists in the addition of a short 

 paragraph at p. 3, explanatory of the section in the frontispiece, and 

 of references to the Geological Survey Memoirs, where more detailed 

 accounts of the sections, etc., are to be found. B. B. W. 



III. — On the Geological Conditions affecting the Water 

 Supply of Houses and Towns, with Special Reference 

 TO THE Modes of Supplying Oxford. By J. Prestwich, M.A., 

 E.E.S., etc. (Oxford : Parker & Co.) 



WATER-SUPPLY in relation to geological structure of a district 

 is a subject to which Prof. Prestwich has paid considerable 

 attention. His work, " The Water-bearing Strata of the Country 

 around London," published some years since (1851), was the care- 

 fully considered result of much labour and experience derived from 

 his geological investigations relating to the subject, with a view of 

 affording to the metropolis a larger and purer supply of water ; and 

 this practical knowledge rendered him an efficient member of the 

 Royal Commission on Water-Supply of 1866. In this lecture, the 

 subject is continued in relation to the water-supply of Oxford, and, 

 after some general but interesting observations, the author alludes to 

 the former supply from the river, and the present supply from the 

 valley gravel, and its sanitary bearing ; and then proceeds to indicate 

 other sources of supply dependent on the geological conditions of 

 the surrounding country, which are fully discussed, as well as 

 the quality of the water likely to be obtained. From this, it 

 appears that the various sources for a better supply to Oxford 

 are — the water in the gravel beneath the alluvial deposits of the 

 Isis, taken above Oxford, — by an artesian well north of Oxford, 

 by springs in the Chalk and Oolites, as well as from wells in 

 the same formations, both of which would yield an abundant 

 and excellent water; the only objection to the latter two sources 

 being their distance from Oxford. We cordially recommend 

 the perusal of this lecture not only to the inhabitants of Oxford, but 

 the general reader, and to those interested in taking precautionary 

 measures for preventing the pollution of water supply. It is accom- 



