Sound and music: an elementary treatise on the physical constitution of musical sounds and harmony, including the chief acoustical discoveries of Professor Helmholtz.

Mode of access: Internet.

Handbuch der physiologischen Optik / von H. von Helmholtz.

"Issued in 17 parts, 1886-1896." - L.C.

The problem of human life : containing the fundamental principles of the substantial philosophy; with a review of the six great modern scientists: Darwin, Tyndall, Huxley, Haeckel, Helmholtz, and Mayer ... /

Printed in two columns.

Hermann von Helmholtz als mensch und gelehrter /

Mode of access: Internet.

Kant und Helmholtz über den Ursprung und die Bedeutung der Raumanschauung und der geometrischen Axiome /

Bibliographical footnotes.