A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



"To the solid ground 

 Of Nature trusts the mind which builds for aye." — WORDSWORTH 



MACMILLAN & CO., ?ublishera, 22 Bond St., NEW YOEK. 



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THURSDAY, DECEMBER 25. 1879. { annual^ubL^ption $6 



NEW SCIENTIFIC BOOKS 



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The Mechanical Thcorj of Heat. 



R. Clausius. Translated by Walter R. Browne, M.A.. late Fellow of Trinity College, Cambridge. i2rno, $2.60. 

 A Maiul-iM.uk of Double Stars, 



'ith a Catalogue of Twelve Hundred Double Stars and Extensive LUts of Measures. With additional Notes bring- 

 ing the Measures up to 1379. For the use of amateurs. By Edu Crossley, F.R.A.S., Joseph Gledhill, F.R.A.S., 

 and James M. Wilson, M.A., F.R.A.S. With Illustrations. 8vo, $6. 



Studies 011 Fermentation. 



le Diseases of Beer. Their Causes and the Means of Preventing them. By L. Pasteur. A Translation, with Notes, 

 Index, and original Illustrations. By Frank Faulkner and D. Constable Robb, B.A. 8vo. $6. 



Blowpipe Analysis. 



y J. Landauer. Authorized English Edition, by James Taylor and William E. Kay. l6mo, $1.50. 



Units and Physical Constants. 



y J. D. Everett, M.A., D.C.L., F.R.S., etc., Professor of Natural Philosophy in Queen's College, Belfast. l6mo, $1.10. 



An Introduction to the Theory of Electricity. 



Tith numerous Examples. By Linnaeus Cumming, M.A. Second Edition, with Corrections and Additions. i2mo, 

 $2.25. 



Pharmacographia. 



History of the Principal Drugs of Vegetable Origin met with in Great Britain and British India. By Friedrich A. 

 FlOckiger and Daniel Hanbury, F.R.S. Second Edition. 8vo, half bound, $5. 



The Metaphysics of the School. 



ly Thomas Harper, S.J. Svo, $5. 



The Electrical Researches of the Hon. Henry Cavendish, F.R.S. 



ifritten between 1771 and 1781. Edited from the original MS. by J. Clark Maxwell, F.R.S. 8vo, $5. 



Hydrodynamics : 



Treatise on the Mathematical Theory of the Motion of Fluids. By Horace Lamb. M.A., Professor of Mathematics in 

 the University of Adelaide. 8vo, $3. 



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