Just published, in 1 vol. uniform. 



HELMHOLTZ'S POPULAR LECTURES on SCIENTIFIC 

 SUBJECTS, SECOND SERIES, translated by E. ATKINSON, Ph.D. F.C.S. 

 With numerous Woodcuts. Crown 8vo. price 7*. Gd. 



LIST of the LECTURES : 



I. Gnstav Magnus ; In Memoriam. II. On the Origin and Significance 

 of Geometrical Axioms.-lII. Optics in its Relation to Painting. 1, 

 Form ; , Shade ; 8, Colour ; 4, Harmony of Colour -IV. On the Forma- 

 tion of the Planetary System. -V. On the Freedom of Academical 

 Teaching. VI. On Thought in Medicine. 



HELMHOLTZ on the SENSATIONS of TONE as a Physio- 

 logical Basis for the Theory of Music. Translated, with the Author's 

 sanction, from the Third German Edition, with Additional Notes and 

 an Additional Appendix, by ALEXANDER J. ELLIS, F.R.S. &c. 8vo. 

 price 36*. 



ft is hardly too much to say that this 

 volume far exceeds in value any and 

 every rimilar work.' ORCHESTRA. 

 ' The most important contribution 



tmpor, 



to the science of music which has at 

 any period been received from a sin/tie 

 source.' MUSICAL STANDARD. 



The present book supersedes all 

 other treatises on the physics of 

 musical sound and the necessary 



relations of this to systems of melody 

 ""'"PALL MALL GAZETTE. 



' It is unnecessary for us to say 

 that this famous book will be wel- 

 comed alike by the physicist, the 

 acoustician, and the musician. It is 

 one of the most original works of the 

 second half of this century.' 



QUARTERLY JOURNAL OF SCIENCE. 



London, LONGMANS & CO. 



