(Volumes ready, in press, and in preparation.) +The Study of Man.+ By Professor A. C. HADDON, M.A., D.Sc., Royal College of Science, Dublin. Illustrated. 8^o, $2.00 +The Groundwork of Science.+ A Study of Epistemology. By ST. GEORGE MIVART, F.R.S. 8^o, $1.75 +Rivers of North America.+ A Reading Lesson for Students of Geography and Geology. By ISRAEL C. RUSSELL, LL.D., Professor of Geology in the University of Michigan. Illustrated. 8^o, $2.00 +Earth Sculpture.+ By Professor JAMES GEIKIE, F.R.S., University of Edinburgh. Illustrated. 8^o, $2.00 +Volcanoes.+ By T. G. BONNEY, F.R.S., University College, London. Illustrated. 8^o, $2.00 +Bacteria.+ By G. NEWMAN, M.D., F.R.S., Demonstrator of Bacteriology in King's College, London. Illustrated. 8^o. +The Stars.+ By Professor SIMON NEWCOMB, U.S.N., Nautical Almanac Office, and Johns Hopkins University. +Meteors and Comets.+ By Professor C. A. YOUNG, Princeton University. +The Measurement of the Earth.+ By Professor T. C. MENDENHALL, Worcester Polytechnic Institute, formerly Superintendent of the U. S. Coast and Geodetic Survey. +Earthquakes.+ By Major C. E. DUTTON, U.S.A. +Physiography; The Forms of the Land.+ By Professor W. M. DAVIS, Harvard University. +The History of Science.+ By C. S. PEIRCE. +General Ethnography.+ By Professor DANIEL G. BRINTON, University of Pennsylvania. +Recent Theories of Evolution.+ By J. MARK BALDWIN, Princeton University. +Whales.+ By F. E. BEDDARD, F.R.S., Zoölogical Society, London. +The Reproduction of Living Beings.+ By Professor MARCUS HARTOG, Queen's College, Cork. +Man and the Higher Apes.+ By Dr. A. KEITH, F.R.C.S. +Heredity.+ By J. ARTHUR THOMPSON, School of Medicine, Edinburgh. +Life Areas of North America: A Study in the Distribution of Animals and Plants.+ By Dr. C. HART MERRIAM, Chief of the Biological Survey, U. S. Department of Agriculture. +Age, Growth, Sex, and Death.+ By Professor CHARLES S. MINOT, Harvard Medical School. +Bacteria.+ Dr. J. H. GLADSTONE. +History of Botany.+ Professor A. H. GREEN. +Planetary Motion.+ G. W. HILL. +Infection and Immunity.+ GEO. M. STERNBERG, Surgeon-General U.S.A. End of the Project Gutenberg EBook of Bacteria, by George Newman