"American Addresses." First edition printed 1877; reprinted 1886.
"Anatomy of Invertebrated Animals," 1877.
"Physiography." First edition, 1877; reprinted 1877, 1878, 1879, 1880, 1881, 1882, 1883, 1884, 1885 (three times), 1887, 1888, 1890, 1891, 1893, 1897.
"Hume." English Men of Letters Series. First edition printed 1878; reprinted 1879 (twice), 1881, 1886, 1887, 1895.
"The Crayfish: an Introduction to the Study of Zoology," 1879.
"Evolution and Ethics." First edition printed 1893; reprinted 1893 (three times); second edition, 1893 third edition, 1893; reprinted 1894.
"Introductory Science Primer." First edition printed 1880; reprinted 1880, 1886, 1888, 1889 (twice), 1893, 1895, 1899.
"Science and Culture, and other Essays." First edition printed 1881; reprinted 1882, 1888.
"Social Diseases and Worse Remedies." First edition printed 1891; reprinted, with additions, 1891 (twice).
"Essays on some Controverted Questions." Printed in 1892.