REVIEWS. 61 



theory and practice, sufficient to enable the engineer and user to decide as to 

 the actual state of windmill construction, its history and progress, its probable 

 direction and development, and the degree of economy attained as compared 

 with that of other prime movers. The work is illustrated with a number of 

 well-executed engravings. 



On Light. By George Gabriel Stokes, M.A., F.R.S., etc. 



Cr. 8vo, pp. vi. — 107. (London : Macmillan and Co. 1885.) 



This is a second course of the Burnett Lectures, delivered at Aberdeen 

 in 1884, the subject being " Light as a means of Investigation." It treats of 

 — I. — Absorption and its application to the Discrimination of Bodies. II. — 

 The Emission of Light consequent thereon. III. — The Rotation of the 

 Plane of Polarisation, of Polarised Light, etc. IV. — The Emission of Light 

 by Incandescent Bodies in a State of Vapour, etc. V. — The information thus 

 afforded as to the Constitution or Condition of Distant Bodies. VI. — The 

 Influence of the Motion of Bodies on the Refrangibility of the Light Emitted, 

 Absorbed, or Reflected by them. 



Field's Chromatography : A Treatise on Colour and Pig- 

 ments, for the use of Artists. Modernised by J. Scott Taylor, B.A., Cantab. 

 Second edition, cr. 8vo, pp. viii. — 207. (London: ^Yinsor and Newton. 

 1885.) Price 7s. 6d. 



To some extent this is a condensed and revised issue of Field's Chromato- 

 graphy, by F. W. Salter, but many of the chapters are entirely re-written. It 

 is a handsome volume ; many of the plates are in colours. 



Charles Darwin. By Grant Allen. Cr. 8vo, pp. vi. — 206. 



(London: Longmans, Green, and Co. 1885.) Price 2s. 6d. 



This is the first of a series of Enghsh worthies, edited by Andrew Lang. 

 The author deals with Mr. Darwin as a thinker and worker more than with 

 the biographical details of his private life. The opening chapters deal with 

 the world into which Darwin was born, Darwin and his antecedents, his early 

 days, and his works. 



Numerical Examples in Heat. By R. E. Day, M.A. New 



edition. Post 8vo, pp. vi. — 176. (London : Longmans, Green, and Co. 

 1885.) 



This work contains a number of well-chosen arithmetical questions on 

 Heat, including Thermometers, Expansion, Pendulums, Barometrical Correc- 

 tions, Hygrometry, Latent Heat, Calorometers, and Thermodynamics. A 

 sufficient number of examples is worked out fully to enable the student, with 

 careful study, to test his own knowledge by answering the remainder. We 

 think it a most useful little book. 



Cholera : Its Origin, History, Causation, Symptoms, Lesions, 

 Prevention, and Treatment. By Alfred Stille, M.D., LL.D. 8vo, pp. 164. 

 (Philadelphia: Lea Brothers and Co. 1885.) Price $1.25. 



The author seeks to exhibit the specific nature of cholera drawn from its origin 

 and mode of propagation, to disabuse the medical profession of the erroneous 

 notion that disease ever originates de novo, to maintain the necessity of "quaran- 

 tine," to point out the channels by which cholera may be diffused, and to des- 

 cribe measures to prevent its dissemination and cure those who are attacked by 



