“The book is cleverly written and is one of the best works of its kind ever put before the public. It will be interesting to all readers, and especially to those interested in the study of science.”--_New Haven Leader._ =3.=--=Rivers of North America.= A Reading Lesson for Students of Geography and Geology. By ISRAEL C. RUSSELL, Professor of Geology, University of Michigan, author of “Lakes of North America,” “Glaciers of North America,” “Volcanoes of North America,” etc. Fully illustrated. 8^o. “There has not been in the last few years until the present book any authoritative, broad résumé on the subject, modified and deepened as it has been by modern research and reflection, which is couched in language suitable for the multitude.... The text is as entertaining as it is instructive.”--_Boston Transcript._ =4.=--=Earth Sculpture; or, The Origin of Land-Forms.= By JAMES GEIKIE, LL.D., D.C.L., F.R.S., etc., Murchison Professor of Geology and Mineralogy in the University of Edinburgh; author of “The Great Ice Age,” etc. Fully illustrated. 8^o. “This volume is the best popular and yet scientific treatment we know of of the origin and development of land-forms, and we immediately adopted it as the best available text-book for a college course in physiography.... The book is full of life and vigor, and shows the sympathetic touch of a man deeply in love with nature.”--_Science._ =5.=--=Volcanoes: Their Structure and Significance.= By T. G. BONNEY, F.R.S., University College, London. Fully illustrated. 8^o. Revised and Enlarged Edition. Illustrated. “It is not only a fine piece of work from a scientific point of view, but it is uncommonly attractive to the general reader, and is likely to have a larger sale than most books of its class.”--_Springfield Republican._ =6.=--=Bacteria=: Especially as they are related to the economy of nature, to industrial processes, and to the public health. By GEORGE NEWMAN, M.D., F.R.S. (Edin.), D.P.H. (Camb.), etc., Demonstrator of Bacteriology in King’s College, London. With 24 micro-photographs of actual organisms and over 70 other illustrations. 8^o. “Dr. Newman’s discussions of bacteria and disease, of immunity, of antitoxins, and of methods of disinfection, are illuminating, and are to be commended to all seeking information on these points. Any discussion of bacteria will seem technical to the uninitiated, but all such will find in this book popular treatment and scientific accuracy happily combined.”--_The Dial._ #/ =7.=--=A Book of Whales.= By F. E. BEDDARD, M.A., F.R.S. Illustrated. 8^o.