April 7, 189;; 



SCIENCE. 



195 



would not be so apt to fall into error as when (as in the case 

 considered) an entirely incorrect theory is embedded, labelless, 

 in a mass of facts. 



The book is very clearly written and the style is good. The 

 only misprints in the hook appear to be those on pages 80 and 

 81, where the velocity of light is twice given as 185 miles per 

 second. 



Magnetism and Electricity. By Arthdr William Potser, MA., 

 Headmaster of ^V'isbprh Grammar School. London and 

 New York, Longmans, Green & Co. 

 This book is arranged in the same way as Silvanus P. Thomp 

 son's text-book, and is intended for the same pnrpo.'e. In some 

 ways it is more complete than the latter, and the type is larger 

 and clearer. The illustrations, especially, are well drawn, and 

 it is with delight that one realizes the absence of most of the old 

 stereotypes which have done duty in so many scores of text- 

 books. This is explained in the preface, where we learn that 

 out of the 317 engravings in the book, more than 200 are from 

 original drawings. At mtervals throughout the book are given 

 the directions for some 300 experiments, evidently car-efuUy 

 selected, and there are also twenty four sets of exercises given, 

 with the answers to the more difficult examples in them. The 

 book seems one of the best suited for teaching purposes that has 

 appeared and is brought quite up to date. It needs amplifying, 

 however, in those parts which relate to magnetic cii'cuits and 

 permeability. R A. F. 



Catalogue of American Localities of Minerals. By Edward S. 



Dana. From the 6lh Edition of Dana's Mineralogy. New 



York, J. Wiley & Sons, 1893. .51 p. .8°. 

 This catalogue will serve a useful purpose in enabling students 

 of mineralogy to readily ascertain just where in any State or Ter- 

 ritory the best localities for minerals are. The information is 

 classified under States, beginning with Maine and ending with 

 Alaska, and followed by the Canadian provinces. A few general 



rem;irks are made under each State, Territory or Province, and 

 then follow t!ie counties and the towns where the mineral locali- 

 ties are. It would have been made more valuable by the addition 

 of an index to the minerals mentioned, since then it would have 

 been possible to ascertain in a few moments where any particular 

 species occurs. 



AMONG THE PUBLISHERS. 



S. C. GHiaas & Co., Chicago, announce for early publication 

 a work by Elizabeth A. Reed, author of "Hindu Literature," etc., 

 entitled " Persian Literature, Ancient and Modern " 



— Mr. William Salter, the author of " Ethical Religion," has 

 issued, through Charles H. Kerr & Co. of Chicago, a small book, 

 entitled " First Steps in Philosophy." It is very plain and simple 

 in style and as free as possible of technical terms; and in these re- 

 spects is well adapted to its purpose. It omits so much, however, 

 that it can hardly be deemed a sufficient introduction to philo- 

 sophical study. It gives no general view of the problems of 

 philosophy nor of the methods of studying it. The general theory 

 of knowledge is not touched upon ; and the question of theism is 

 not raised, the first part of the book being wholly devoted to the 

 doctrine of perception and the nature of matter. The author's 

 views on these points are substantially those of the idealists; 

 though he shows a certain leaning towards realism, and evidently 

 is not quite satisfied with the idealistic theory. The second part 

 of the book, which treats of ethics, is much more satisfactory, 

 and will be read with interest even by those who do not accept 

 the author's views. He discusses the nature and foundation of 

 duty, criticises the doctrines of intuitionalists and utilitarians, 

 and gives as his own theory one substantially like that of Hegel, 

 which regards the complete realization of everyone's nature as 

 the supreme end of action. Though not wholly satisfactory, this 

 little book may serve to awaken the philosophic impulse in minds 

 naturally susceptible of it, and be the propedeutic to more elabo- 

 rate studies. 



^sia 



Dr. T H. Andrews, J fferson 

 Medical College, Philadelphia, bays of 



Horsford's Acid Phosphate. 



" A wonderful remedy which gave me 

 most gratifying results in the worst 

 forms of dyspepsia." 



It reaches various forms of 

 Dyspepsia that no othei medi- 

 cine seems to touch, assisting 

 the weakened stomach, and 

 making the process of diges- 

 tion natural and easy. 



Descriptive pamphlet free on application to 

 numford Chemical Works. Providence, R. I. 



Heware of Substitutes and Imitations. 



For sale by all Druggists. 



Exchanges. 



[Freeof charge to all, if of satisfactory character. 

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



Fine cotlection of microscopic slides for sale, or 

 would exchange for flrsi-class pneumatic bicycle. 

 J. E. Whitney, Box 549, Rochester, N. Y. 



For sale — A Zentmayer new model U. S. Army 

 Hospital monocular stand. Price $110, will sell for 

 $75. Address H. C. Wells, No. 151 Broadway, New 

 York. 



For sale— A complete set of the third series of the 

 American Journal of Science (1870-1693) handsomely 

 bound in single volumes in dark brown half moroc- 

 co. Address G. H. Williams, 803 Cathedral Street, 

 Baltimore, Md. 



For sale, or for exchange for books on medi- 

 cine or surgery, new editions only, a large geo- 

 logical library, containing nearly ail the State and 

 Government Reports sincA 18.'i5. Will be pleased to 

 answer letters of inquiry and give intorraation. 

 Address R. ELLSWORTH CALL, Louisville, Ky. 



For exchange.— Slides of Indian Territory Loup 

 Fork 1 ertiary Diatoms for other microscopic fos- 

 sils. Address S. W. WILLISTON, Univ. of Kansas, 

 Lawrence, Kans. 



For exchange. — Will exchange an "Ideal" Mi 

 croscope of R and J. Beck, London, 2 eye pieces 

 3 objectives, 3 inch, 1 incb, 1-6 inch; bulPs eye con 

 denser on stand, substage condenser, mechanica 

 stage, etc., for any of the leading makes of type 

 writers. Particulars by mail. DELOS FALL, Albion 

 College, Albion, Mich. 



For sale or exchange. — T have a few copies of my 

 translation of " Strasburger^'s Manual of Vegetable 

 Histology, 1887," now out of print, which I will send 

 post-paid for ©3 or for one dozen good slides illus- 

 trating plant or animal structure. Address A. B. 

 Hervey, St. Lawrence University, Canton, N. Y. 



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. lepidolite, blue and green onyx, Gal. pine- 

 ite, aragonite on chalcedony, cinnabar, double re- 

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

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



For sale or exchange. —A private cabinet of about 

 •200 species of fossils, well distributed geologically 

 and geographically. Silurian, about 40; Devonian, 

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

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



Wants. 



THE undersigned desires specimens of North 

 American Galiinae in the flesh for the study of 

 their pterylosis. These species are especially de- 

 sired : Colinus ridgivayi, cyrtonyx montezumae^ 

 deudragapusfranklini^ lagopus tvelchi,tympanuchus 

 ctipido and pedioecetes phasianellus. Any persons 

 having alcoholic specimens which they are willing 

 to loan or wbo can obtain specimens of any of the 

 above are requested to communicate with Hubert 

 Lyman Clark, 3922 Fifth Avenue, Pittsburgh. Pa. 



WANTED— Second-hand copy Tryon's Systematic 

 Conchology. Please quote condition, date, price. 

 H. L. Osborn, Hamline University, St. Pauh Minn. 



A 



COMPETENT TEACHER of botany in college 

 or university is open to engagement. Address 

 Box 86, Rochester, Mich. 



CAN any one inform me as to the age to which 

 cats have lived? I have one twenty years old. 

 Edward D. Webb, 133 W. Eighty-first St., New York. 



WANTED — Second-hand. Foster's Physiology, 

 Balfour's Comparative Embryology, Glaus & 

 Sedgwick's Zoology, Flower's Osteology of Mam- 

 malia, Vine's Physiology of Plants. Please state 

 editions and prices asked and address Richard 

 Lees Brampton, Ontario, Canada 



WANTED.— American Journal of Conchology, 

 seven volumes. Parties having these for 

 sale will please address the undersigned, stating 

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



A 



GRADUATE ENGINEER will give instructiOD 

 evenings in geometry, trigonometry and sur- 

 veying, mechanics, physics, mechanical drawing 

 and general engineering construction. Five years' 

 experience in field and editorial work on engineer- 

 ing journal. References furnished. C. S. H., 102 

 Tribune Building, New York. 



W 



ANTED.— By well - qualified and experienced 

 science master and associate of the Royal 



School of Mines. London, aged 26 (at present 

 England), a mastership ^n technical college or uni- 

 versity for any of the following subjects: Engineer- 

 ing sciences geology and mineralogy, physics, chem- 

 istry and metallur^iy, etc.. etc. Can provide excel- 

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

 Sussex St., Rochdale, England. 



