Robert Hardavkke, 192, Piccadilly, w. 



Complete in cloth, price 2s. Gel. 



Prof. Huxley's Lectures "On the 

 Origin of Species.'' 



1. The Present Condition of Organic Nature. — 2. The Past Con- 

 dition of Organic Nature. — 3. The Method by which the Caust-s 

 of the Present and Past Conditions of Organic Nature are to be 

 discovered. The Origination of Living Beings. — 4. The Per- 

 petuation of Living Beings, Hereditary Transmission, and Variation. 

 — j. The Condition of Existence as affecting the Perpetuation of 

 Living Beings. — C. A Critical Examination of the Position of Mr. 

 Darwin's Work " On the Origin of Species," in relation to the 

 complete Theory of the Causes of the Phenomena of Organic 

 Nature. 

 " Readers who cannot accept Mr. Darwin's doctrines and conclusions will still be 

 delighted with these lectures, since they embody so much curious information and so 

 ;:-.any important principles of biological science, expressed so clearly as to render tin' 

 nook, even to readers possessing scarcely any previous knowledge of the subject, not 

 only intelligible but more interesting than any romance." — Yi'etdoii's Register. 



Price 2s. Cd. 



Landscape Photography. 



Or, Complete and Easy Description of the Manipulations and 

 Apparatus necessary for the production of Landscape Pictures, 

 Geological Sections, &c, by theCalotype, Wet Collodion, Collodio- 

 Albumen, Albumen-gelatine, and Wax-paper processes ; bj the 

 assistance of which, an Amateur may at once commence the art. 

 By Joachim Otte, F.G.S. 

 "To the commencing amateur the book seems very well adapted, and to onewh" 



wishes to practise photography as an amusement or an adjunct to any other pursuit, 



;t maybe cordially recommended." — Literary Gazette. 



Demy Svo. cloth, price 12s. 



The True Figure and Dimensions of 

 the Earth. 



Newly determined from the results of geodetic measurements and 

 pendulum observations ; compared with the corresponding theo- 

 retical elements, for the first time deduced upon purely geometrical 

 principles ; and considered both with reference to the progress of 

 scientific truth, and as bearing upon the practical interests of British 

 commerce and navigation ; in a Letter addressed to George Biddell 

 Airy, Esq., M.A., Astronomer Royal. By Johannes von Gum- 

 pach. Second edition, entirely recast, with thirty illustrative, 

 diagrams. 



