BY THE SAME AUTHOR. 



SATURN AND ITS SYSTEM: 



With 14 finely finished Engravings on Steel and Copper 8vo. price 14*. 



'A most valuable volume From it, more 



than from almost any other hook with which 

 we are acquainted, do we get an idea of the 

 stupendous actual and potential energies of our 

 minds, and of the many-sided attacks made by 

 them upon things unknown. How many in a 

 thousand know as much of our earth as any- 

 body may learn about. Saturn in a day from the 

 book before us? Mr. PROCTOR is happy in his 

 subject, and equally happy in his treatment of 

 it. The illustrations are second to none we 

 have ever seen, and add greatly to the value of 

 the book, the style of which is really a model 

 of a semi-special treatment of a scientific 

 subject.' RKADER. 



' Though professedly limited to one planet, 

 the work is a valuable treatise on general 

 astronomy.' JOURNAL OF SCIENCE. 



'A remarkable work Well deserving the 



study of those who feel an interest in this 

 wonderful object.' INTELLECTUAL OBSERVER. 



'Mr. PROCTOR'S new theory of the rings 

 indefinitely raises our estimate of the mar- 

 vellous nature of the phenomena they exhibit ' 



SPECTATOR, Firtt Notice. 

 'Mr. PROCTOR may fairly claim the title of 

 the historian of Saturn. All that is known 

 about the planet, and all that can be conjectured 

 by a well-trained mathematical mind, is detailed 

 at length in this volume.' 



SPECTATOR, Second Notice. 

 'A monograph, and a very complete one.' 



ATHENAEUM. 



' A work which merits the attention of all to 

 whom Saturn is an object of interest. The 

 illustrations are a marvel of vivid engraving 

 in steel and copper.' 



ILLUSTRATED LONDON NEWS. 

 'A beautiful monograph upon the ringed 

 planet, well written and full of erudition. 



POPULAR SCIENCE REVIEW. 



THE STARS IN TWELVE GNOMONIC MAPS: 



So arranged that while the distortion in each map is greatly less than in any star-maps yet 

 constructed on the (rnomonic projection, the constellations of each hemisphere are exhibited 

 an a single view in their proper relative positions. The maps are given in duplicate, two 

 steel plates (coloured) presenting the usual features of star-maps, while two stereo plates 

 exhibit the Stars and Milky Way alone on a black background. Royal 4to. price, complete 

 with Introduction, in stiff paper cover, 7s. ; steel plates, coloured, each 2s. 6d. ; stereo 

 plates, each 6(7. 



Convenient precise, and easily intelligible.' 



POPULAR SCIENCE REVIEW. 

 ' We have never, in our experience, met with 

 plates more beautifully drawn. The letterpress 

 furnishes complete and very interesting ex- 

 planations of the contents of the maps.' 



EDUCATIONAL TIMES. 



' The best star-maps we have seen.' 



READER. 



'The most generally useful series that have 

 appeared.' INTELLECTUAL OBSERVER. 



' An ingenious plan, well executed.' 



ATHENAEUM. 



A NEW STAR-ATLAS. 



In 12 Circular Maps, 13 inches in diameter, containing all the stars visible to the naked 

 eye, and about 1,500 objects of interest (red stare, double stars, &c.). Photolithographed by 

 A. BROTHERS, F.R.A.S. With '2 coloured Index Maps (see preceding announcement) and a 

 letterpress Introduction. In small folio : price with Index Maps, 25s., without, 1 ; clotn. 

 (bevelled edges). 



' I have no objection to your mentioning my 

 high approval of this work.' 



From a letter by SIR JOHN HERSCHEL. 



' A splendid book, an indispensable com- 

 panion for all speculative astronomers who can 

 afford to use it. These maps are a far better 

 substitute for the heivens than anything we 

 have yet possessed. Their real value lies in 

 their wonderful accuracy, united with their 

 extreme convenience for reference. It is not 

 easy to convey an idea of the amount of thought 

 and labour expended in bringing these maps to 

 the utmost point of perfection ; and the grati- 

 tude of all who are interested in astronomy is 



due to Mr. PROCTOR and Mr. BROTHERS, for 

 the liberal and loving execution of a work 

 from which they can scarcely expect to receive 

 any adequate pecuniary remuneration." 



GUARDIAN. 



'A set of maps of the heavens which are as 

 excellent in mere details of printing as they 

 are accurate and reliable In an astronomical 

 sense. We are compelled to offer our best 

 thanks to Mr. PROCTOR for the great labour 

 and time which he must have spent in his 

 endeavour to bring them to their present 

 perfection.' POPULAR SCIENCE REVIEW. 



London : LONGMANS and CO. 



