Contains bibliographies The American journal of science from 1818 to 1918, by E.S. Dana.--A century of geology: the progress of historical geology in North America, by C. Schuchert.--A century of geology: steps of progress in the interpretation of land forms, by H.E. Gregory.--A century of geology (continued): the growth of knowledge of earth structure, by J. Barrell.--A century of government geological surveys, by G.O. Smith.--On the development of vertebrate paleontology, by R.S. Lull.--The rise of petrology as a science, by L.V. Pirsson.--The growth of mineralogy from 1818 to 1918, by W.E. Ford.--The work of the geophysical laboratory of the Carnegie institution of Washington, by R.B. Sosman.--The progress of chemistry during the past one hundred years, by H.L. Wells and H.W. Foote.--A century's progress in physics, by L. Page.--A century of zoology in America, by W.R. Coe.--The development of botanty since 1818, by G.L. Goodale