Works by the same Author. 



A NEW STAB ATLAS, for the Library, the School, and 

 the Observatory, in 12 Circular Maps (with 2 Index Plates). 

 Intended as a Companion to ' Webb's Celestial Objects for 

 Common Telescopes.' Kevised Edition, with an Introduction on 

 the Study of the Stars, illustrated by 9 Diagrams. Crown 8vo. 

 price 5s. 



A STAR ATLAS for STUDENTS and OBSERVERS, 



showing 6,000 Stars and 1,500 Double Stars, Nebulae, &c. in 

 12 Maps on the Equidistant Projection ; with Index Map on 

 the Stereographic Projection. Fourth Edition. Folio, 15s. 



LIGHT SCIENCE for LEISURE HOURS; Familiar 

 Essays on Scientific Subjects, Natural Phenomena, &c. 3 vols. 

 Crown 8vo. price 7s. Gd. each. 



A TREATISE on the CYCLOID and on all Forms of 



Cycloidal Curves, and on the use of Cyctoidal Curves in dealing 

 with the Motions of Planets, Comets, &c. and of Matter pro- 

 jected from the Sun. With 161 Diagrams. Crown 8vo. 10s. 6d. 



TRANSITS of VENUS ; a Popular Account of Past and 

 Coming Transits from the First Observed by Horrocks A.D. 1639 

 to the Transit of A.D. 2012. Fourth Edition, including an 

 Account of the Successes Achieved in December 1874, and Sug- 

 gestions respecting the Transit, December 1882. With 20 

 Plates (12 Coloured) and 38 Woodcuts. 8vo. 8s. 6d. 



STUDIES of VENUS-TRANSITS ; an Investigation of 

 the Circumstances of the Transits of Venus in 1874 and 1882. 

 By K. A. PROCTOB, B.A. Cantab. (Originally forming part of 

 ' The Universe and the Coming Transits.') With 7 Diagrams 

 engraved on Wood and 10 Plates of Figures. 8vo. 5s. 



by the admirable and very careful maps. 

 Mr. PROCTOR, in fact, is a born map- 

 maker ; he loves putting things graphi- 



' For those readers and students who 

 wish to understand the exact nature of 

 the questions to be decided by the 

 forthcoming foreign expeditions to ob- 

 serve the Transit of Venus on Dec. 6 of 

 the present year, Mr. PROCTOR'S essays 

 will form a valuable contribution to the 

 comprehension of the case. His little 

 book consists of several interesting 

 studies, selected from the monthly 

 notices of the Royal Astronomical 

 Society or other like sources, all written 

 with that perspicuous lucidity which 

 enables the Author to put even un- 

 mathematical readers immediately in 

 possession of the right point of view. 

 In fathoming these apparently difficult 

 but really very simple conceptions, the 

 student or reader will be much aided 



cally on paper ; and whatever he puts 

 he puts so clearly that nobody with a 

 little patience and application can pos- 

 sibly fail to understand his meaning. 

 Whilst most other astronomers think 

 in terms of symbols and mathematical 

 formulae, it is Mr. PROCTOR'S special 

 distinction that he seems to think in 

 terms of concrete reality to picture 

 the objects vividly before his mind's 

 eye in their actual relations, instead of 

 envisaging them under the guise of x, 

 y, and z, worked out in sheet after 

 sheet of algebraical calculation.' 



PALL MALL GAZETTE. 



London, LONGMANS & CO. 



