DISCOVERY 



125 



account of what has been clone by the meteorologists, and 

 also indicates much that has still to be done. 



The instruments used in meteorology, the thermometers, 

 barometers, hygrometers, rain-gauges, sunshine recorders, 

 etc., are well described. It is a pity that the illustrations 

 have not come out better. They are rather small, 

 and some axe hardly clear enough ; but reproduction of 

 •photographs and diagrams, except in an expensive book, 

 is not an easy matter at the present time. 



We recommend this book. 



Dr. McAdie is the Professor of Meteorology at Harvard 

 University. This book of his is a joy. No one can read 

 it without feeling that Meteorology, or Aerography as it is 

 called here, is a great subject. This is a book for the 

 student — that is to say, a reader is supposed to be equipped 

 with a sound and comprehensive knowledge of elementary 

 Physics ; but the general reader may read most of the book 

 without being taken appreciably out of his depth, and as 

 a work of reference on the subject of the weather it is 

 admirable. The importance of this book lies in the fact 

 that the autlior has put all the latest information on the 

 subject into it, and that it is exceptionally well illustrated. 

 He advocates scrapping the old system of units in force, 

 and bringing in without further ado the C.G.S. system. 

 He believes in classifying clouds according to their origin 

 rather than their appearance. Some of the subjects dealt 

 « ith. which are not included in the ordinary textbook, are 

 studies of air-flow at different levels, studies of ice-storms, 

 snowfall equivalents, and water-supply, charts for airmen, 

 variations of ocean currents, and recent knowledge of solar 

 phenomena. 



A guinea for a work of three hundred pages seems a stiff 

 price, but the book is most beautifully produced in every 

 way. There are more than fifty photographs, and they are 

 all very clear, so too are the diagrams and charts. The 

 man who writes it knows thoroughly what he is talking 

 about, and he knows how to write, so altogether a charm- 

 ing book results. 



The Development of the Atomic Tlwory. By A. N. 

 Meldrum, Fellow of the Bombay University. 

 (Oxford University Press, is. 6d. net.) 

 Dr. Meldrum has given us an interesting contribution 

 to the history of Chemistry. He shows, among other 

 things, that Dalton, who brought out his famous Atomic 

 Theory in 1S03, was forestalled by one Higgins by no less 

 than fourteen years. Higgins's ideas about atoms, un- 

 fortunately for him, fell on a somewhat heedless world. 

 There is no suggestion in this essay that Dalton plagia- 

 rised from Higgins. Both, starting from Newton's doc- 

 trine of an elastic fluid, reached essentially the same 

 conclusions, only Higgins the unknown was fourteen 

 years ahead of Dalton. 



Laboratory Manual of Elementary Colloid Chemistry. 



By E. Hatschek. (Churchill, 6s. 6d. net.) 



This is a book we can thoroughly recommend. It is, 



indeed, almost a necessary book for- honours students of 



Chemistry, because some knowledge of colloids is nowa- 



[Contiiuud on p. 126 



NEW AND ENLARGED EDITION 



MICROSCOPY 



THE CONSTRUCTION, THEORY. AND USE 

 OF THE MICROSCOPE 



BY EDMUND J. SPITTA 



F.R.A.S., F.R.M.S., etc. 



The Third Edition of this standard work has been 

 considerably enlarged, and twelve new plates have 

 been included. These latter consist of additional 

 test-objects for objectives of different focal length, 

 and, what is a novelty, two "critical images" to 

 assist the student to recognize critical definition. 

 Among items of special interest dealt with is an 

 exf lanation of the use of the new short wave-length 

 film screens in conjunction with a high power arc- 

 lamp, for increasing the resolving power of objectives 

 of large numerical aperture, and improving the 

 definition with others of longer focal length ; and also 

 the employment of combinations specially designed 

 to deal with extra large objects at low magnifications. 



^hird Edition, with 83 half-lone reproductions 

 and 255 text illustrations - - 25s. ne( 



LONDON : JOHN MURRAY 



THE 



RENAISSANCE 

 IN ITALY 



By J. A. SYMONDS 



IN SEVEN VOLUMES. IQs. 6A "et each 



1. THE AGE OF THE DESPOTS 



2. THE REVIVAL OF LEARNING 



3. THE FINE ARTS 



4&5. ITALIAN LITERATURE 

 6&7. THE CATHOLIC REACTION 



" There is no doubt that his picture of the Re- 

 naissance is, in the main, true, while there is even 

 less doubt about the attractiveness, to the general 

 reader, of the style in which he handled his sub- 

 ject." — Times. 



" It is not necessary to say anything of the historic 

 value and literary quality of Symonds' book. The 

 new edition is produced in a handsome and appro- 

 priate fashion." — Manchester Guardian. 



LONDON : JOHN MURRAY 



