"Professor Mach's lectures are so pleasantly written and illumined with such charm of illustration that they have all the interest of lively fiction."—New York Com. Advertiser.

"The literary and philosophical suggestiveness of the book is very rich." Hartford Seminary Record.

"All are presented so skilfully that one can imagine that Professor Mach's hearers departed from his lecture-room with the conviction that science was a matter for abecedarians. Will please those who find the fairy tales of science more absorbing than fiction."—The Pilot, Boston.

"Professor Mach ... is a master in physics.... His book is a good one and will serve a good purpose, both for instruction and suggestion."—Prof. A. E. Dolbear, in The Dial.

"The most beautiful ideas are unfolded in the exposition."—Catholic World, New York.

[THE ANALYSIS OF THE SENSATIONS]

By DR. ERNST MACH.

PROFESSOR OF THE HISTORY AND THEORY OF INDUCTIVE SCIENCE IN THE UNIVERSITY OF VIENNA.