We have to apologize for the delay of some Articles already announced, 

 and which will certainly appear in our next Number, together with addi- 

 tional Communications from Mr. Leighton and Mr. Babington. 



MR. SCHOMBURGK'S COLLECTION. 



We would gladly direct the attention of our readers to the Sale of the 

 very valuable collection of objects of Natural History, &c, made by Mr. 

 Schomburgk during his stay in Guiana, which is now going on at the 

 Cosmorama, No. 209, Regent Street. 



TAYLOR'S SCIENTIFIC MEMOIRS, translated from Foreign 

 Journals and the Transactions of Foreign Academies : Part VII. is just 

 puMished, containing: — 



Gauss — Terrestrial Magnetism. 

 Encke — Method of Least Squares. 

 Heikrich Rose — jEtherification. 



Bessel — Elliptic Spheroid of Revolution, representing measured Arcs of the 

 Meridian. 



Ohm — Mathematical investigation of the Galvanic Circuit. 

 With Eight Plates, illustrative of the Theories of Terrestrial Magnetism and of 

 the Galvanic Circuit. 



R. and J. E. Taylor, Red Lion Court, Fleet Street. 



GEOLOGICAL TRANSACTIONS. 



VOLUME V., PART III., was published on the 17th of June. 493 

 pages 4to, 27 Plates of Fossils, Coloured Maps and Sections, 24 Wood- 

 cuts, and the following papers :— Prestwich on Coalbrook Dale; Fox on Mineral 

 Veins; Cautley and Falconer on the Astragalus of a Fossil Monkey ; Darwin on 

 the Formation of Mould ; Owen on the Tail of the Ichthyosaurus, and on the 

 Pksiosaurus Macrocephalus ; Malcolmson on India; Bell on Mazunderan ; Ha- 

 milton on Asia Minor; Strickland on Sandstone Dykes ; Darwin on Earthquakes ; 

 Sedgwick and Murchison on Devonshire; Stokes on Orthocerata; Sykes on 

 Cutch Fossils; and Lonsdale on the Limestones of South Devon. List of Dona- 

 tions and Index. Price to the Fellows, 1/. 16s. ; to the Public, 21. 5s. 



Sold at the Apartments of the Society, Somerset House. The Second Edition 

 of Mr. Greenough's Geological Map of England and Wales is just published, and 

 may also be procured at the Apartments of the Society. Price to the Fellows, 

 41. ; to the Public, 51. 



THE LAND BIRDS COMPLETE. 



In Three large vols. 8vo, with 278 Wood-cuts and 22 Plates of Digestive Organs, 



&c, price 21. 16s. in cloth, 



MACGILLIVRAY'S HISTORY OF BRITISH BIRDS: com- 

 prising detailed descriptions of the form and structure, and a full account 

 of the habits of the entire series of Land Birds. 



Just published, Vol. III., containing the Birds of Prey, Shrikes, Swallows, 

 Woodpeckers, Cuckoos, Creepers, &c, and a systematic Index to the three volumes, 

 with 95 Wood-cuts and 9 Plates (780 pp.), price 24s. 

 Vols. I. and II. are also sold separately, price 16s. each. 



" I consider this the best work on British Ornithological Science with which I 

 am acquainted." — J. J. Audubon." 



London : Scott, Webster and Geary, Charterhouse Square. 



Naturalist's Library — New Volume. Completing " The Dog." 

 Just published, being Vol. XXVIII. of Sir W. Jardine's Naturalist's Library, 



price 6s., 



DOGS. By Lieut.-Col. C. Hamilton Smith. Illustrated by 38 

 Coloured Plates, with Portrait and Memoir of D'Azara. 

 In this Volume is given a complete synopsis of the Canidse, including the genera 

 Canis, Hyaena, and Proteles ; forming with the First Volume lately published, the 

 best Natural History of the Dog extant. 



The Two Volumes (price 12s.) contain 70 Coloured Plates. 



S. Highley, 32, Fleet Street. London ; W. H. Lizars, Edinburgh ', 



Curry and Co., Dublin. 



