8 BOOKS PUBLISHED BY ME. VAN VOORST. 



Manual of the Mineralogy of Great Britain and Ireland. 

 By BOBEET PHILIPS GREG, F.G.S., and WILLIAM G. 

 LETTSOM. 8vo, with numerous Woodcuts, 15s. 



History of British Fossil Mammals and Birds. By Pro- 

 fessor OWEN. This volume is designed as a companion to that 

 by Professor Bell on the (Eecent Mammalia) ' British Quadru- 

 peds and Cetacea,' 8vo, with 237 Illustrations, £1 lis. Qd., or 

 large paper (royal 8vo), £3 3s. 



Description of the Skeleton of an Extinct Gigantic Sloth 



(Mylodon robustus). With Observations on the Osteology, 

 Natural Affinities, and probable Habits of the Megatherioid Qua- 

 drupeds in general. By RICHARD OWEN, F.R.S., &c. 4to. 

 £1 12s. 6d. 



Geological Inquiry respecting the Water-bearing Strata 

 of the Country around London, with reference especially to the 

 Water Supply of the Metropolis, and including some Remarks 

 on Springs. By JOSEPH PEESTWICH, Jun., E.G.S., &c. 

 8vo, with a Map and Woodcuts, 8s. Q>d. 



Memoirs of Hugh E. Strickland, M.A., Deputy Reader of 

 Geology in the University of Oxford. By SIR WILLIAM 

 JARDINE, Bart. ; with a selection from his Printed and other 

 Scientific Papers. One Vol. Eoyal 8vo, 3Gs., Illustrated by Maps, 

 Geological Sections, Plates and Woodcuts. 



Omphalos. An Attempt to Untie the Geological Knot. By P. H. 

 GOSSE, F.R.S. In this -work the author aims to overthrow the 

 received conclusions of geologists as to the remote antiquity of 

 the earth, by the enunciation and illustration of a grand physical 

 law, hitherto unrecognized, the law of Proclrronism in organic 

 creation. Post 8vo, pp. 37G, with 50 Illustrations on wood, 

 10s. Qd. 



WORKS ON GENERAL NATURAL 

 HISTORY, &c. 



The Aquarian Naturalist : a Manual for the Sea-side. By Pro- 

 fessor T. RYMER JONES, F.E.S. Post 8vo, 544 pp., with 

 8 Coloured Plates, price 18s. 



Humble Creatures: the Earthworm and the Common 



Housefly. In Eight Letters. By JAMES SAMUELSON, as- 

 sisted by J. A. HICKS, M.D. Lond., E.L.S. With Microscopic 

 Illustrations by the Authors. Post 8vo, price 3s. 6d. 



JOHN VAN VOORST, 1 PATERNOSTER ROW. 



