January 20, 1893.] 



SCIENCE. 



41 



pletely changed its aspect, the physics of to-day being distinctly 

 the science of energy. It is from this point of view that the text- 

 book has been written, the classification which has been adopted 

 being based on the most recent views of energy, considereJ as 

 being ultinDately a phenomenon of the aether. The fact is signifi- 

 cant that more than lialf of the entire work has been devoted to 

 sether-physics. 



The introductory portion of the book considers, first, physical 

 relations in general, and second, the laws of motion; the latter 

 being discussed, first in the abstract, and second with reference 

 to the action of force upon matter. Under mass-physics energy 

 is first treated of as a mass-condition, and then work, as being 

 done whenever energy is transferred or transformed; the subject 

 of potential being developed as a consequence of mass-attraction. 

 The properties of matter are next considered, including the mod- 

 ern views of its structure; and then follo>vs the subject of sound 

 considered as a mass- vibration. Under molecular physics the 

 phenomena of heat alone are treated; the term heat being re- 

 stricted, in accordance with modern usage, to molecular kinetic 

 energy. Under the head of sether-physics are grouped: (1) 

 aether-vibration or radiation, (3) aether-stress or electrostatics, (3) 

 aether-vortices or magnetism, and (4) aether-flow or electro- 

 kinetics; following the classification so well set forth by Lodge. 

 Radiation is considered broadly without any special reference to 

 those wave-frequencies which excite vision and are ordinarily 

 called light. 



The ground covered is that which is usually traversed by stu- 

 dents in the more extended courses in physics in our leading uni- 

 versities, colleges, and technological institutes. 



The book is well printed and well illustrated, a colored mag- 

 netic map of the United States being given as a frontispiece. The 

 text is interspersed with examples, and descriptions of illustrative 

 experiments in smaller type. The metric system has been u.^ed 

 throughout, and all the units employed are those of the C. G. S. 

 system. 



Although the preface only bears date of October 1, 1893, a sec- 

 ond edition has already been issued. 



AMONG THE PUBLISHERS. 



A NEW edition of Haeokel's "The History of Creation," has 

 been issued in Germany, and a translation, revised by Professor 

 E. Ray Lankester, is just published in this country by D. Apple- 

 ton & Co. The book is a popular exposition of the doctrine of 

 evolution In general, and of that of Darwin, Goethe, and Lamarck 

 in particular. The reviser calls it "a statement of the views of 

 one of the most learned, experienced, and honored naturalists of 

 modern times." It is issued in two volumes, with numerous il- 

 lustrations. 



— D. Appleton & Co. publish a "Dictionary of Every- Day 

 German and English," by Martin Krummacher, Ph.D. In addi- 

 tion to the dictionaries proper, it contains lists of the most impor- 

 tant technical terms, proper names spelled differently in the two 

 languages, a sound-notation, an outline of grammar, and several 

 pages of " travel talk " in parallel columns. 



— Ginn & Company announce "A Students' Manual of a La- 

 boratory Course in Physical Measurements," by W. C. Sabine, 

 Instructor in Harvard University, to be published in February. 

 The manual will contain an outline of seventy experiments in 

 mechanics, sound, heat, light, magnetism, and electricity, ar- 

 ranged with special regard to a systematic and progressive devel- 

 opment of the subject. The description of each experiment will 

 be accompanied by a brief statement of the physical principles 

 and definitions involved, and a proof of necessary formulae. 

 That the manual may be of more ready and general service a set 

 of appai'atus has been designed which is especially adapted to the 

 course and can be found complete on the market. The book is 

 intended for use in supplementing college courses in physics. 



Bffspepsia 



Dr. T, H, Andrews, Jefferson 



Medical College, Philadelphia, says of 



Horsford's Acid Phosphate. 



"A wonderful remedy which gave me 

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It reaches various forms of 

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Descriplive pamphlet free on application to 

 Ruiuford Chemical Works, Providence, R. I. 



Beware of Substitutes and Imitations. 



For sale by all Druggists. 



Reading Matter Notices. 



Ripans Tabules : for torpid liver. 

 Ripans Tabules banish pain. 



Exchanges. 



[Freeof charge to all, if ofsatisfactory character. 

 Address N. D. C. Hodges, 874 Broadway, New York.l 



The undersigned has the following specimens to 

 exchange for crystals of any eastern or foreign lo- 

 calities or Indian relics: tin ore, metacinnabarite, 

 stibnite, garnierite, calenanite, hanksite, ulexite, 

 rubellite, iepidolite,blue and green onyx, Cal. pine- 

 ite, aragonite on chalcedony, cinnabar, double re- 

 fracting spar, clear and clouded, and others. J. R. 

 Eush, care of General Delivery, Los Angeles, Cal. 



For sale or exchange.— A private cabinet of about 

 200 species of fossils, well distributed ideologically 

 and geograpbically. Siluriau, about 40; Devonian, 

 about 50; Carboniferous, about 80; others, about 30. 

 Frank S. Aby, State University, Iowa City, la. 



For exchange —Minerals, fossils, F. W. shells, 

 land shells, native woods, Indian relics, two vols, 

 of Smithsonian reports, odd numbers of scientific 

 magazines, copper cents, etc., for good minerals 

 not in my collection, good arrow- and spear-heads 

 and natural history specimens of all kinds. Cor- 

 respondence solicited with list of duplicates. G. 

 E. "Wells, Manhattan, Kan. 



For sale or suitable exchange. — A spectrometer 

 made by Fauth & Co., Washington, D. C., according 

 to the plan of Prof. C. A. Young. This instrument 

 is suitable for the most advanced investigations 

 and determinations. Cost originally $700 and has 

 been used but little. Will be disposed of at a con- 

 siderable reduction. Address Department of Phys- 

 ics, Ohio University, Athens, O. 



I will send British land and fresh-water shells in 

 return for those of America, any part, sent to me. 

 I have at present about fifty or sixty species, with 

 many varieties. "W. A. Gain, Tuxford, Newark, 

 England. 



The Biological Department of HamlineUciversity 

 desires to offer microscopic slides of animal tissues, 

 or whole animals, in exchange for first-class fossils. 

 Address correspondeoce to Henry L. Osborne, Ham- 

 line University, Hamline, Minn. 



fc ACK NUMBERS and complete sets of leading Mag- 

 I azines. I?ates low. AM. MAG. EXCHANGE. 

 ' Schoharie N V 



Wanis. 



WANTED.— American Journal of Conchology- 

 seven volumes. Parties having these for 

 sale will please address the undersigned, stating 

 condition and price. R.Ellsworth Call,LouisviUe,Ky. 



A GRADUATE ENGINEER will give instruction 

 evenings in geometry, trigonometry and sur- 

 veying, mechanics, physics, mechanical drawing 

 and general en^iineering construction. Five years' 

 experience in field and editorial work on engineer- 

 ing journal. References furnished. C. S. H., lOi 

 Tribune Building. New York. 



A POSITION is detired in the South, preferablv 

 l\ the Gulf States, where I can teach the sciences 

 Can also instruct in other branches. Salary only 

 nominal, as I am simply desirous of employment 

 while spending the winter in the South. A private 

 farailv preferred, but will acceot regular school 

 work if not too confining. MORRIS (jIBBS, M.D,, 

 Ealamazoo, Mich. 



WANTED.— By well - qualified and experienced 

 science master and associate of the Royal 

 School of Mines, London, aged 26 (at present in 

 England), a mastership m technical college or uni- 

 versity for any of the following subjects: Engineer- 

 ing sciences, geology and mineralogy, physics, chem- 

 istry and metallurgy, etc., etc. Can provide excel- 

 lent references and credentials. Apply, J. G., 17 

 Sussex St., Rochdale. England. 



AGRADQATE of the University of Pennsylvania 

 and a practical mineralogist of twenty years' 

 experience desires to give his services and a cabi- 

 net of 3-5,100 specimens, all named, with about the 

 same number of duplicates, in minerals, crystals, 

 rocks, gems, fossils, shells, arch^ological and ethno- 

 logical specimens and woods to any institution de- 

 siring a fine outfit for study. The owner will in- 

 crease the cabinet to 50,000 specimens in two years 

 and will act as curator. Correspondence solicited 

 from any scientific institution, J. W. Hortter, 

 M.D.. Ph.D., San Francisco, Cal., General P. O. 

 Delivery. 



POPULAR MANUAL OF VISIBLE SPEECH AND 

 VOCAL PHYSIOLOGY. 



For use in Colleges and Normal Schools. Price 50 cents 



Sent free by post by 



N, D. C. HODGES, 874 Broadway, N- Y. 



