A book describing the Practical Methods of identifying Minerals in Rock Sections with the Microscope[17] has been prepared by Mr. L. McI. Luquer to ease the path of the student inexperienced in optical mineralogy by putting before him only those facts which are absolutely necessary for the proper recognition and identification of the minerals in thin sections. The microscopic and optical characters of the minerals are recorded in the order in which they would be observed with a petrographical microscope; when the sections are opaque, attention is called to the fact, and the characters are recorded as seen with incident light. The order of Rosenbusch, which is based on the symmetry of the crystalline form, is followed, with a few exceptions made for convenience. In an introductory chapter a practical elementary knowledge of optics as applied to optical mineralogy is attempted to be given, without going into an elaborate discussion of the subject. The petrographical microscope is described in detail. The application of it to the investigation of mineral characteristics is set forth in general and as to particular minerals. The preparation of sections and practical operations are described, and an optical scheme is appended, with the minerals grouped according to their common optical characters.
Mr. Herbert C. Whitaker's Elements of Trigonometry[18] is concise and of very convenient size for use. The introduction and the first five of the seven chapters have been prepared for the use of beginners. The other two chapters concern the properties of triangles and spherical triangles; an appendix presents the theory of logarithms; and a second appendix, treating of goniometry, complex quantities, and complex functions, has been added for students intending to take up work in higher departments of mathematics. For assisting a clearer understanding of the several processes, the author has sought to associate closely with every equation a definite meaning with reference to a diagram. Other characteristics of the book are the practical applications to mechanics, surveying, and other everyday problems; its many references to astronomical problems, and the constant use of geometry as a starting point and standard.
A model in suggestions for elementary teaching is offered in California Plants in their Homes,[19] by Alice Merritt Davidson, formerly of the State Normal School, California. The book consists of two parts, a botanical reader for children and a supplement for the use of teachers, both divisions being also published in separate volumes. It is well illustrated, provided with an index and an outline of lessons adapted to different grades. The treatment of each theme is fresh, and the grouping novel, as is indicated by the chapter headings: Some Plants that lead Easy Lives, Plants that know how to meet Hard Times, Plants that do not make their own Living, Plants with Mechanical Genius. Although specially designed for the study of the flora of southern California, embodying the results of ten years' observation by the author, it may be recommended to science teachers in any locality as an excellent guide. The pupil in this vicinity will have to forego personal inspection of the shooting-star and mariposa lily, while he finds the century plant, yuccas, and cacti domiciled in the greenhouse. In addition to these, however, attention is directed to a sufficient number of familiar flowers, trees, ferns, and fungi for profitable study, and the young novice in botany can scarcely make a better beginning than in company with this skillful instructor.
Prof. John M. Coulter's Plant Relations[20] is one of two parts of a system of teaching botany proposed by the author. Each of the two books is to represent the work of half a year, but each is to be independent of the other, and they may be used in either order. The two books relate respectively, as a whole, to ecology, or the life relations of surroundings of plants, and to their morphology. The present volume concerns the ecology. While it may be to the disadvantage of presenting ecology first, that it conveys no knowledge of plant structures and plant groups, this disadvantage is compensated for, in the author's view, by the facts that the study of the most evident life relations gives a proper conception of the place of plants in Nature; that it offers a view of the plant kingdom of the most permanent value to those who can give but a half year to botany; and that it demands little or no use of the compound microscope, an instrument ill adapted to first contacts with Nature. The book is intended to present a connected, readable account of some of the fundamental facts of botany, and also to serve as a supplement to the three far more important factors of the teacher, who must amplify and suggest at every point; the laboratory, which must bring the pupil face to face with plants and their structure; and field work, which must relate the facts observed in the laboratory to their actual place in Nature, and must bring new facts to notice which can be observed nowhere else. Taking the results obtained from these three factors, the book seeks to organize them, and to suggest explanations, through a clear, untechnical, compact text and appropriate and excellent illustrations.
The title of The Wilderness of Worlds[21] was suggested to the author by the contemplation of a wilderness of trees, in which those near him are very large, while in the distance they seem successively smaller, and gradually fade away till the limit of vision is reached. So of the wilderness of worlds in space, with its innumerable stars of gradually diminishing degrees of visibility—worlds "of all ages like the trees, and the great deep of space is covered with their dust, and pulsating with the potency of new births." The body of the book is a review of the history of the universe and all that is of it, in the light of the theory of evolution, beginning with the entities of space, time, matter, force, and motion, and the processes of development from the nebulæ as they are indicated by the most recent and best verified researches, and terminating with the ultimate extinction of life and the end of the planet. In the chapter entitled A Vision of Peace the author confronts religion and science. He regards the whole subject from the freethinker's point of view, with a denial of all agency of the supernatural.
In a volume entitled The Living Organism[22] Mr. Alfred Earl has endeavored to make a philosophical introduction to the study of biology. The closing paragraph of his preface is of interest as showing his views regarding vitalism: "The object of the book will be attained if it succeeds, although it may be chiefly by negative criticism, in directing attention to the important truth that, though chemical and physical changes enter largely into the composition of vital activity, there is much in the living organism that is outside the range of these operations." The first three chapters discuss general conceptions, and are chiefly psychology. A discussion of the structures accessory to alimentation in man and the higher animals occupies Chapters IV and V. The Object of Classification, Certain General Statements concerning Organisms, A Description of the Organism as related to its Surroundings, The Material Basis of Life, The Organism as a Chemical Aggregate and as a Center for the Transformation of Energy, Certain Aspects of Form and Development, The Meaning of Sensation, and, finally, Some of the Problems presented by the Organism, are the remaining chapter headings. The volume contains many interesting suggestions, and might perhaps most appropriately be described as a Theoretical Biology.
"Stars and Telescopes,"[23] Professor Todd says, "is intended to meet an American demand for a plain, unrhetorical statement of the astronomy of to-day." We might state the purpose to be to bring astronomy and all that pertains to it up to date. It is hard to do this, for the author has been obliged to put what was then the latest discovery, made while the book was going through the press, in a footnote at the end of the preface. The information embodied in the volume is comprehensive, and is conveyed in a very intelligible style. The treatise begins with a running commentary or historical outline of astronomical discovery, with a rigid exclusion of all detail. The account of the earth and moon is followed by chapters on the Calendar and the Astronomical Relations of Light. The other members of the solar system are described and their relations reviewed, and then the comets and the stars. Closely associated with these subjects are the men who have contributed to knowledge respecting them, and consequently the names of the great discoverers and others who have helped in the advancement of astronomy are introduced in immediate connection with their work, in brief sketches and often with their portraits. Much importance is attributed by Professor Todd to the instruments with which astronomical discovery is carried on, and the book may be said to culminate in an account of the famous instruments, their construction, mounting, and use. The devisers of these instruments are entitled to more credit than the unthinking are always inclined to give them, for the value of an observation depends on the accuracy of the instrument as well as on the skill of the observer, and the skill which makes the instrument accurate is not to be underrated. So the makers of the instruments are given their place. Then the recent and improved processes have to be considered, and, altogether, Professor Todd has found material for a full and somewhat novel book, and has used it to good advantage.
Some Observations on the Fundamental Principles of Nature is the title of an essay by Henry Witt, which, though very brief, takes the world of matter, mind, and society within its scope. One of the features of the treatment is that instead of the present theory of an order of things resulting from the condensation of more rarefied matter, one of the organization of converging waves of infinitesimal atoms filling all space is substituted. With this point prominently in view, the various factors and properties of the material universe—biology, psychology, sociology, ethics, and the future—are treated of.
Among the later monographs published by the Field Columbian Museum, Chicago, is a paper in the Geological Series (No. 3) on The Ores of Colombia, from Mines in Operation in 1892, by H. W. Nichols. It describes the collection prepared for the Columbian Exposition by F. Pereira Gamba and afterward given to the museum—a collection which merits attention for the light it throws upon the nature and mode of occurrence of the ores of one of the most important gold-producing countries of the world, and also because it approaches more nearly than is usual the ideal of what a collection in economic geology should be. Other publications in the museum's Geological Series are The Mylagauldæ, an Extinct Family of Sciuromorph Rodents (No. 4), by E. S. Riggs, describing some squirrel-like animals from the Deep River beds, near White Sulphur Springs, Montana; A Fossil Egg from South Dakota (No. 5), by O. C. Farrington, relative to the egg of an anatine bird from the early Miocene; and Contributions to the Paleontology of the Upper Cretaceous Series (No. 6), by W. N. Logan, in which seven species of Scaphites, Ostrea, Gasteropoda, and corals are described. In the Zoölogical Series, Preliminary Descriptions of New Rodents from the Olympic Mountains (of Washington) (No. 11), by D. G. Elliot, relates to six species; Notes on a Collection of Cold-blooded Vertebrates from the Olympic Mountains (No. 12), by S. E. Meek, to six trout and three other fish, four amphibia, and three reptiles; and a Catalogue of Mammals from the Olympic Mountains, Washington, with descriptions of new species (No. 13), by D. G. Elliot, includes a number of species of rodents, lynx, bear, and deer.