BY
| L. COUTURAT | O. JESPERSEN | R. LORENZ |
| Formerly Professor at the University of Caen. | Professor at the University of Copenhagen. | Professor at the Federal Polytechnicum of Zürich. |
| W. OSTWALD | L. PFAUNDLER |
| Professor emeritus of the University of Leipzig. | Professor at the University of Graz. |
TRANSLATED BY
F. G. DONNAN
Professor at the University
of Liverpool.
LONDON
CONSTABLE & COMPANY LIMITED
10 ORANGE STREET LEICESTER SQUARE W.C.
1910