SCIENCE-ADVERTISEMENTS 



" Mr. McKready's book is the finest " The subject is trea d in a master- 



thing for the beginner that I have "A Baedeker for the Sky^' ly manner. The illustrations are ex- 



everaeen. It is a pleasure to read a » f-» . « cellent, the descriptions are in appro- 



book so excellent in so many different A K60''innd* C priate terms, the suggestions to be- 



ways. 1 have never seen photographs ^^ i-»w^iiiiiw» o ginners are thoroughly practical, and 



reproduced better. I have never seen ^■fa ♦•_Flr»rkL' the information i« reliable. In other 



maps of the heavens so intelligible to OldF— UULIIv words the author has prepared a 



the beginner, and I have never read \„ Easy Qulde to the Stars and to learned book on an elementary sub- 

 explanations so concise and yet so the Astronomical (Js«s of the Opera ject. I cannot too strongly commend 

 complete as in this book."— Pro/. S. ^. Qlass, the Fleld-Qlass and the Telr- the work as "A Beginner's Star- 

 Mitch,eU,JF'.R,A.S.,DepartmentofAstron-^copt Book." — TK IF. Campbell, LL.D., 



omy, Columbia University, New York _ i.r . . »« ¥^ j JF.S.A.S.,Directorof the Lick Observatory. 



««^- ^^y.^^^Vlt^''^''T^.^ , -Itissuperb,-far superior to any- 

 With charts of the Moon, Tables of thing of the kind I have ever seen 

 "I want to express my admiration "j* Planets and Star-maps on a new before. Chapter IV containing the 

 for the ingenuity which you have f '"'■ ^ *' c->"^c«i if ^"''^ii iir^^''^* star-maps pleases me especially. It 

 shown in providing means for tracing °^°- Net, S2.s8. By mall, $2.75. jg extremely practical." — Pro/. Gr- 

 and locating the constellations as well 11 !iT„„„, „„,4U ;,„.,„ „i „„j„, mond Stone, Director of the Observatory, 



as lor the amount of usefulinforma- Many authors have already Univernty of Virginia. 



tion you have collected and put in a undertaken to condense into a ,,t » . t v, ^„„t„„f„„»„i i, 



fo?nV^.1,for^%fJSiX'\'hi':i r'^ri "^ '?f ^'""^"^^' ""' sogJod'tS'l.s'arvlcT'fJr^'tra'.Sa'trur 

 pectto make mulh useofit witha knowledge useful to an amateur as 'A Beginner's Star-Book^' The 

 class in descriptive astronomy."- beginning the study of the sky. "°''^ ^ ^ onceover Us pages, the more 

 Prof. William Beebe, M.A., Dept. of As- BUT NEVER, WE BELIEVE. HAS \ "StaFhe^ F EAS Chah-mak of Ike 

 ironomy, Yale Umversity. this INTENTION BEEN REALIZED ^J,,f l^'l^Wf of Co^V^'S™. "^ 



WITH SO MUCH SUCCESS OS m ,, , cceeded' in de fne 



-^ At the first glance into your book the volume recently published by from the usu\f book for amateur^in I 

 I was surprised at the splendid illus- Mr. Kelvin McKready under the numberof ways, to the decided advan- 

 traiions. They are very remarkable . , , . Beainner\ Stnr-Rnnk ' tage of the work. I feel verv sure 

 reproductions [ganz ausgezeichnete ttlf A aegmners Ular tioolc. tult it every teacher of astronomy in 

 Reproduktionen] from the best origi- Whether one desires to obserue gghools or colleges could have a copy 



nals ; and they adorn the book m xvith the naked eye, with glasses of the work and could place one at 

 lett\?rTerfe'ct7on^ucra??Slve^^^^ held in the hand, or with a tele- the disposal of his class, Ic would help 

 elsewliere seen [in einer Vollendung, scope of moderate price, he will properTy^ InsUuctiifg 'thf^swdents"" 

 J^'t ^^^ ml ^°"^' nirgends gesehen fa^d in this book, advice excellently —Dr Edwin B. Frost, F.B.A.S., Birec- 

 moonlphotog'raphs"nirt'o"thetoon! adapted io_ each situaiion-and tor of the Yerkes Obsc.atory. 

 charts, from phase to phase, is a happy clear definite explanations of the "Will save much time and un- 

 idi-a. The star.maps for the different diijlcuUies which may embarrass a necessary annoyance at the telescope, 

 months, separated for the northern },„„,■„„„- A imei nf ■nlnf/'^ ^lyith The book is very practical indeed, 

 and southern skies are extremely use- "<'!/""»'• fi i^eritt, uj puiiet,, wun ^ j, j^e best book for the amateur 

 ful and stimulating for the beginner, accompanying Key-maps, permit with which 1 am acquainted."— Pro/. 

 The text of the book is thoroughly us to follow the moon ihrouqh all David Todd, F.R.A.S., Director of the 

 voTumlis°UnLlcillSfrSaLge'^f^ her phases, the starry sky through Obsermiory. Amherst College, Mass. 

 volume IS wen caicuiateo iganzgeeig- ,, f^ ' a a » "The author has shown not only an 



net] to inspire the amateur with en- aM/^seosons. intimate knowledge of those phases 



thusiasm lor the study, and yet to " The author does not list all the of this subject in which beginners are 

 which%o™ofte™ prove 'fataT"^^^ ^" ^he catalogues. fl-g much interested, but also of the way 



Max Wolf, Director of the Konigstuhl Ob- makes a judicious choice of the 'ro^c^e'd The book cannMfai^^be- 

 servatory, Heidelberg, Germany. most accessible and the most typi- lieve, to be very useful both ' as a 



cal. He possesses in the highest handbook for the student in the 



" So many people ask for the name degree the art of promising only ^^^ool and for the general reader" 

 of a book by which they can them. .J„, j,. ..„ „/.f£,™ „/• L,.^rw ^''■- ^- ^ Claxton.Vntted States Com- 

 selves learn and teach to others the '"t "f f"" V^rjorm, OJ saying missioner of Education, Washington. 

 names of the stars or answer questions ont?/ ii)/iaJ he knows thoroughly. "i know of no book on the subject 

 about simple things in astronomy. Each page reveals to us the which combines so many good quall- 

 They insist on the necessity for the iminprl ntfmnnmpr rnmhinpri i/u'lh M^s. It is written In simple language 

 utmost simplicity of language and ^rainea asironmner ,comoinea Willi ^j^^^ ^^^ minimum use of such tech- 

 ample easy illustration. Your book H^^ patient ana iucia teacner. nical terms as might puzzle the 

 provides all this more perfectly than P. PUISEUX, novice; yet the wide range of sub- 

 any work of the kind that I know. Member of the Institute ; Astrono- J«cts covered, and the accuracy of 

 1 quite concur with your American i ih ni f r> • • their presentation, ought to make it 

 reviewers, that the star-maps and luer at me Uoservatory oj raris ; very valuable to many students who 

 key-maps are most admirably de- President of the Astronomical have long pasied the elementary 

 signed and executed, and provide, in Society of France stage. Two characteristics of the text 

 the simplest possible way, all that is .,, . . ', . deserve especial mention: the clear 

 needed for self-instruction. The All wnO Order the nboVC VOl= ness of the explanations, and the 

 merits of the book by no means end ume direct from US will also amount of space given (with the best 

 here. I have read no book which is _-„„:„„ „,,- H„c/-i-ir.«- Jx/<. <-:•-/-•■. of reason) to just those matters which 

 so likely to appeal to the young imagi- , / 7. „ ,/" j u i i ■ '"'e '"os' likely to perplex the intend- 

 nation, which presents in a more at- lar of the McKready multiple inc observer at the outset ; and, most 

 tractive way the wonders of the sky. Telescope, — peculiarly the in- of all, the thoroughly scientiflc spirit 

 or which is more likely to teach the _tr„n,-„<. f^.. <-hno q4- hntmo of the work. The data are accurate, 

 enquiring mind and lead its owner sirumcni lor inose ai nome and are taken from the best and most 

 to more seriousreading and research, or in the SChOOl whO WISH tO recent authorities; the references to 

 The very admirable reproductions of share the pleasure and inter- these authorities, and the bibliog- 

 the magnificent photographs of ne- „_i „« ^y,^ i-«l«.o<-/«n«> ■arith raphy at the end of the book are 

 bulae. star-clusters, comets, etc., much X^f lyi, ,i e c i i ^ * i °f ""^ highest value to the student 

 enhance the value of the work. But O i it ti K S. Special Catalog vpho wishes to pursue the science 

 its great merits are the new and use- on request. further: and, all through the work, 

 ful lines on which the book Is planned, emphasis is placed upon things of 

 the suggestive and simple manner in THE TELESCOPE truly intellectual interest. I shall 

 which it is written, and the gradual ,r.r.i /-/->«/■•->• «.,•«/ recommend it to those who inquire 

 way in which the reader is drawn on 5UPPLV COMPANY of me for the best book for the 

 to deeper and more practical inter- ., ,_-, -r • ci ^ amateur."— Dr. Henry Norris Russell, 

 est in the subject." — ,Str David Gill, rvo. 15.^ 1 eiTipIe Jstreet p.R A.S., Director of the Observatory, 

 K.C.B., LL.D., F.R.S.,ctc. New tiaven, Conn. Princeton Univa-sity. 



