his "Heroes" is a book much appreciated by the boys and girls alike.

PROCTOR, R.A., English astronomer, born, 1834; died, 1888. He was a
very popular writer, and lectured on astronomical subjects in this
country, and in England and her colonies. A memorial teaching
observatory is erected in his honor near San Diego, Cal. He was a man
of untiring industry, an athlete, a musician, and a chess-player. His
books are numerous. Among them are "Half Hours with the Telescope,"
"Other Worlds than Ours," "Light Science for Leisure Hours," "The
Expanse of Heaven," "The Moon," "The Borderland of Science," "Our
Place Among Infinites," "Myths and Marvels of Astronomy," "The
Universe of Suns," "Other Suns than Ours," etc.

SHALER, N.S., professor of geology at Harvard. Born Newport, Ky.,
1841. Served in the Union Army during the Civil War. Instructor
zooelogy, geology, and paleontology, Lawrence Scientific School, till
1887. Since then at Harvard. Is the author of "Kentucky a Pioneer
Commonwealth," "The Story of Our Continent," "The Interpretation of
Nature," "Feature of Coasts and Oceans," "Domesticated Animals," "The
Individual," "Study of Life and Death," etc.

THOMPSON, SIR C. WYVILLE, English zooelogist, born, 1830; died, 1882.
He conducted scientific dredging expeditions in the _Lightning_ and
_Porcupine_, 1868-69, and was the scientific head of the famous voyage
of 68,900 miles in the _Challenger_ for deep-sea explorations
(1872-76). His books are "The Depths of the Sea," and "The Voyage of
the Challenger."

TYNDALL, JOHN, English physicist, born, 1820. Began his original
researches in 1847, when teacher of physics in Queenwood College. He
and Professor Huxley visited the Alps together, and they wrote a work
on the structure and nature of glaciers. It is impossible to detail
the work he has done; but his inquiries and experiments in connection
with light, heat, sound, and electricity have all had practical
results. He is a popular lecturer, and devoted the proceeds of a
lecturing tour in this country to founding scholarships at Harvard and
Columbia Colleges, for students devoting themselves to original
research. Among his books are "Glaciers of the Alps," "Mountaineering,"
"Heat as a Mode of Motion," "On Radiation," "Hours of Exercise in the
Alps," "Fragments of Science," "The Floating Matter of the Air," and
volumes on Light, Sound, Electricity, and the forms of water.

WALLACE, A.R., English naturalist and traveller, b