NATURAL SCIENCE. 



The July number, wMch legins a New Volume, gives a Special Summary of 



THE SCIENTIFIC RESULTS 



OF THE "CHALLENGER" EXPEDITION, 



By Thirty-five of the most eminent Naturalists of the day. 



Erkst Haeckel, Eat Lankester, J. W. Judd, Paul Pelseneer, 

 T. EupERT Jones, C. Baron Clarke, Hjalmar Theel, W. Percy 

 Sladen, p. p. C. Hoek, Sir Wm. Turner, A. Smith Woodward, 

 J. W. Gregory, T. E. E. Stebbing, and W. J. Sollas, are a few 

 of tliose contributing to 



The gul^ jBmttber of jljatural Science. 



EIGHTY PAGES, NUMEROUS TEXT FIGURES, AND SEVENTEEN PLATES. 



For ONE SHILLINa net. 



Orders should he sent without delay through your hoohseller, or direct to — 



RAIT, HENDERSON & CO., 



22, ST. ANDREW ST., LONDON, E.G. 



8i-o, clotli, 240 pages, 4s. &d. nett. 



RE-ISSUE, with Additions by the Author, 



OP 



A GEOLOGICAL INQUIRY 



RESPECTING THE 



WATER-BEARING STRATA OF THE 



COIJNTRY AROUND LONDON. 



With reference especially to the Water-supply of the Metropolis. 



By JOSEPH PEESTWICH, E.G.S., Etc., Etc. 



[EY & JACKSON (Mr. Van Voorst's Successors), 

 1, PATERNOSTEE EOW, LONDOJS". 



