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Vi PRINCIPLES OF MECHANICS them are fuller than the manuscript as finally prepared for the press. With regard to two paragraphs of the work I have found it impossible to satisfy myself, the authors intention as to the final form having remained doubtful to me. I have marked these two paragraphs and have thought it best to leave them entirely unaltered. After sending off the manuscript the author had noted certain corrections in a second copy; all these have been included before printing off. I have completed the references to earlier paragraphs of the book (of which few were given in the second part, and scarcely any in the last chapter), and have drawn up an index to the definitions and notation. P. Lenard. TMNSLATOKS NOTE Hertz s Principles of Mechanics forms the third (and last) volume of his collected works, as edited by Dr. Philipp Lenard. English translations of the first and second volumes (M iscellaneous Papers and Electric Waves) have already been published. The translation of the first two volumes was comparatively easy; the third has proved to be a more difficult undertaking. If it has been brought to a satisfactory conclusion this will be largely due to Professor Lenard, through whose hands the proof-sheets have passed. He has again, notwithstanding the pressure of other work, been good enough to advise and assist us from time to time, and we tender to him our warmest thanks. We also desire to thank the publishers and printers for the extreme consideration shown by them while the book was being prepared for the press. D. E. J. J. T. W. September
(Typographical errors above are due to OCR software and don't occur in the book.)
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