ll known as a successful lecturer
on astronomical subjects in this country.

DARWIN, CHARLES R., English naturalist, born, 1809; died, 1882. He
first formulated what is known as the principle of Natural Selection.
In 1831 he went in the famous scientific voyage of the _Beagle_ as
naturalist, and afterwards published an account of it. He was one of
the most thorough, careful, and painstaking scientific men of this or
any age. He is the author of many famous books. "The Origin of
Species," "The Descent of Man," "Insectivorous Plants," "The Power of
Movement in Plants," "The Structure and Distribution of Coral Reefs,"
"Geological Observations on Volcanic Islands." "The Formation of
Vegetable Mould" was his last published work.

FLAMMARION, C., famous French astronomer, born, 1842. He has written
many popular works on astronomy, most of which have been translated
into English. "The Stars," "The World Before the Creation," "Uranus,"
"Comets," "Popular Astronomy," are among his best known.

HOLDEN, PROF. E.S., American astronomer, born at St. Louis, 1846.
Lieutenant engineers, U.S.A., 1870-73; professor mathematics, U.S.N.,
1873-81; director Washburn Observatory, 1881-85; president University
of California, 1883-88; director Lick Observatory, 1888-98. Is a
member of several learned societies of Europe. Is the author of a
"Life of William Herschel," "A Hand-book of the Lick Observatory,"
"Earth and Sky," "Primer of Heraldry," "Elementary Astronomy," "Family
of the Sun," "Essays in Astronomy," "Stories of the Great
Astronomers," etc.

HUXLEY, T.H., English biologist, born, 1825; died, 1895. Went on an
exploring expedition on the _Rattlesnake_, and devoted himself to the
study of marine life. For his scientific researches he received many
honors. His lectures were models of clearness, and he could simplify
the most difficult subjects. He strongly advocated Darwin's views and
evolutionist doctrines. His writings are numerous and many of them
technical. Among some of the most popular are "Man's Place in Nature,"
his "Lay Sermons," "Critiques and Addresses," "American Addresses,"
"Physiography," "Science and Culture," "Lessons in Elementary
Physiology," etc.

KINGSLEY, C., English clergyman and author, born, 1819; died, 1875.
Wrote "Westward, Ho!" which every boy should read, "Hypatia," "Alton
Locke," "Hereward the Wake," etc., and a charming book of travel,
entitled, "At Last." His "Water Babies" is exceedingly popular, and