KNOW ij:i)(".i:. 



Mw. I'll-'. 



an .'uldi-d cliarm tci kimw the iiiliicatc processes at work in (he 

 propaK'ation of so beautiful a ihitif,' as a wave in tlie sea, but 

 it is even more fascitiatiiik' to learn to appreciate the; unseen 



beauties which accompany a Ilerl/ian wave. 



.\. C. !■:. 



Soap liiibhlcs — Their Colour (tiid the l-'oras u'liich Mould 



titciit. (New eilitionl. — By C. \'. Hovs. F.K.S. 190 pages. 



S2 illus(rations. 7in. X4i-in. 



(Society for Promoting Christian Knowledge. Price 3/-.( 



This book is also another edition of a series of popular 



lectures on a most entrancinR subject, so popular that the 

 distinguished author in his preface mentions that alrc.-idy " two 

 tons of tiny bubbles are lloatiug about the world." No one 

 could help being fascinated by the appearance of a soap 

 bubble, and if that fascination means anything it would give 

 rise to a desire to learn more of the processes of nature which 

 cause such beautiful pheuomena. The book is full of 

 experimental work on soap films of the most interesting nature, 

 and it is not necessary to go further than to recommend it to 

 everyone interested in scientific phenomena. 



A. C. K. 



IIRII'.I' NOTICES ol- llooK.S. 



The list iiicliiih'S books -ivliich hnvc been received since tlie l<ist iiiimher of'' KnowI-EDGE " went to press. 



.ASTRONOMY. 



Aniiiiaire Astronoiiiique pour H/I.i. — My I>'Obsi;rvatoirk 



KnvAi. 1)1-; Hei.giquk. 516 pages. 6 illustrations. 



7.Mn.X4Jin. 



(Brussels: Hayez, Imprimeur de 1,'Observatoire Royal. ( 



We welcome the annual volume published by the Royal 

 Observatory of Belgium, which has been issued without 

 intermission since the year 1834. The meteorological obser- 

 vations were separated from it in 1901 and have since been 

 published by themselves. 



Catalogue of 9S 12 Stars.— n\ T. \\\ P.ACKHnusi;. F.R.A.S. 

 16S p<iges. 12.>-in. X 10-in. 



(Sunderland: Hills & Co. Price 10 6.) 



This catalogue of all the stars which are very conspicuous 

 to the naked eye is applicable to the epoch of 1900, and it is 

 intended to be used with fourteen large star maps. The 

 preface of nearly twenty pages explains its construction and 

 application. 



BOT.ANV. 



The Life of the Plant.— By C. A. Timiriazkii-. 355 pages. 



83 illustrations. 9;!-in.X 5|-in. 



(Longmans. Green & Co. Price 7/6 net.) 



Miss Anna Cheremeteff has translated the seventh Russian 

 edition of Professor TimiriazefTs book to form the volume 

 under consideration. The various plant organs are considered 

 in detail in special chapters prefaced by one dealing with 

 special structure and another on the cell, while the plant again 

 at the end of the book is compared with the animal, the origin 

 of organic forms is discussed, and an appendix deals with the 

 plant as a source of a supply of energy. 



A Manual of Structural Botany. — By Hi:nui H. Risbv. 



14S pages. 599 illustrations. 



9j-in.X6-in. 



(J. & .\. Churchill. Price 10 b net.) 



Dr. Henry Rusby is Professor of Materia Medica in the 

 College of Pharmacy in the city of New York (Columbia 

 Cniversity), and while his book claims to be a fairly complete 

 introduction to Botany it has been written with special 

 reference to the needs of a first year's student of Pharmacv. 



CHEMISTRY. 



Sniolie — A Study of Town Air. — By Julius B. Cohen, 



Ph. D., B.Sc, F.R.S.. and Arthur G. Ruston. B.A., B.Sc. 



88 pages. 35 illustrations. 9-in.X6-in. 



llidward Arnold. Price 5/- net.) 



This small book deals with soot, its eflfects on vegetation, 

 the gaseous impurities of air, town fog, and contains 

 appendices on the influence of coal smoke on health and the 

 soot fall of London. 



GARDENS AND GARDENING. 

 Oxford Gardens.— Hy R. T. GOnther, M.A. 280 pages. 

 .iS illustrations. 7:/-in. X 5{-in. 

 (Parker & Son. Price 6 - net.) 

 Mr. (iiinther's work is based upon Daubeny's Popular Guide 

 to the Physic Garden of Oxford, and has been brought out 

 because neither the Guides written by Dr. Daubeny nor the 

 Garden itself are as well known as they ought to be. During 

 the greater part of the nineteenth century the garden was 

 evidently unknown as a University Institution to the compilers 

 of the University Calendar. Only within the last few years 

 has it been included in the list of University Institutions, and 

 this recognition has coincided with the residence of the 

 Secretary of the delegates of the University Press in a house 

 overlooking the Garden. Mr. Giinther has added notes on 

 the gardens of the colleges and on the University Park, as 

 well as two good indexes. 



Annuals. Hardy and HalfHardy. — Hy ("hari.es H. 



Curtis. Edited by R. Hooper Pearson. 116 pages. 



8 coloured plates. 8J-in.X 6}-in. 



(T. C. & E. C. Jack. Price 16 net.) 

 The latest contribution to the excellent series of books 

 entitled " Present-Day Gardening" is the volume on Annuals. 

 Hardy and Half- Hardy. Its coloured illustrations are as 

 usual by Mr. Ernest Waltham, who is greatly to be congratu- 

 lated on the result of his work. 



GICOLOGY. 



Earth Features and tlicir Meaning.. — By William 



Herbert Hobbs. 506 pages. 493 figures, 24 plates. 



8i{-in.X 54-in. 



(Macmillan & Co. Price 12 6.) 



Professor Hobbs has prepared an expanded form of a 



course of illustrated lectures delivered in the University of 



Michigan. The subjects selected for study are those 



dominant geological processes which are best illustrated by 



features in North .America and Europe. Professor Hobbs 



thinks that to combine in a single text book historical, 



dynamical and structural geology is to make the volume 



unnecessarily encyclopaedic and correspondingly iminteresting 



to the general reader. 



METAPHYSICS. 

 .4 Mcttlunuitical Theory of Spirit. — By H. S. Redgrove. 

 1 25 pages. 8-in. X5i-in. 

 (William Rider & Son. Price 2/6 net.) 

 This book is an attempt to elucidate certain metaphysical 

 problems by the aid of mathematics. The needs of the non- 

 mathematical reader have, however, been constantly kept in 

 view. 



Is the Minil a Coherer ?— By L. G. Sarjant. 304 pages. 



73-in. X5-in. 



Kieorge Allen & Co. Price 6 - net.) 



Some extracts from the " Contents " of this book will give 



an idea of what it contains. .Among the essays which take the 



place of chapters we find some with these headings, " Does 



Matter become Miiul'-": "The Mind a Coherer"; " Non- 



