December 2, 1892.] 



the usual phenomena of chemical action may peruse the work 

 with still more profit. The topics are introduced methodically, 

 beginning with units, states of aggregation, elements and com- 

 pounds, and conditions of chemical action ; but proceeding to the 

 more difficult laws, and giving due notice to such topics as kinetic 

 molecular theory, mass action, dissociation, solution, electrolysis, 

 and the periodic law. Chemical students whose attention has 

 been concentrated on the facts observed in experiment will find 

 these theories very suggestive. 



An Introduction to Chemical Theory. By Alexakder Scott. 



London and Edinburgh, Adam & Charles Black. 8°. 374 



p. $1.35. 

 This volume presents modern views and much valuable infor- 

 mation upon the constitution of matter, atomic and molecular 

 weights, classification of elements and compounds, vapor densities, 

 and other physical properties, thermo-chemistry , chemical change, 

 solution, and electrolysis. It claims to be an introduction only, 

 although a fair knowledge of chemical facts and experiments is 

 assumed; and it would be unreasonable to expect such complete 

 ness as in the works of Ostwald, Meyer, and Naumann. It may 

 prove attractive to many who would be repelled by the more com- 

 prehensive works; or, better still, it may awaken a thirst for such 

 exactness of scientific statement as requires more mathematics 

 than Dr. Scott admits into his elementary volume. 



AMONG THE PUBLISHERS. 



" The Eighteenth Report of the Geological Survey of Indiana: 

 Palseontology," by S. A. Miller, contains descriptions of a large 

 number of new fossils from various formations, mainly of Upper 

 Silurian and Sub-Carboniferous age. Crinoidea largely predomi- 

 nate, no less than 39 new species and 4 new genera being de- 

 scribed. It is unfortunate that some of the species are described 

 from single specimens. All are, however, illustrated. Mr. Miller 



SCIENCE. 321 



pays his compliments in his usual way to Professor James Hall 

 and Professor Hyatt. Some of the new species are from the Cin- 

 cinnati, or Hudson River, group of south-eastern Indiana, 



— St. Nicholas is universally considered "the best of children's 

 magazines." Contributors for 1893 include John G. Whittier, 

 Edmund C. Stedman, Frank R. Stockton, George W. Cable, 

 Frances Hodgson Burnett, Thos. Wentworth Higginson, George 

 Kennan, Charles Howard Shinn, Laura E. Richards, W. O. Stod- 

 dard. Harriet Prescott Spofford, Susan Coolidge, Mary Hallock 

 Foote Kirk Munroe, Hezekiah Butterworth, President Oilman, 

 Rev. Dr. Lyman Abbott, Howard Pyle, Colonel R. M. Johnston, 

 John Burroughs, H. H. Boyesen, Nora Perry, Poultney Bigelow, 

 Charles F. Lummis, Edith M. Thomas, Kate Douglas Wiggin, and 

 Mary Mapes Dodge. 



— Following the principles announced by Teisserenc de Bort, 

 G. Raymond has prepared a little brochure (Paris, Gauthier-Vil- 

 lars) concerning the influence of the chief centres of atmospheric 

 pressure on the prediction of the weather. De Bort laid dowa his 

 general plan some years ago, and Raymond now presents a num- 

 ber of specific examples that seem to follow in accordance with 

 it; illustrating the conditions for mild winters, moist summers, 

 and so on. The book deserves study by those who have access to 

 our International weather bulletins, and vrho can undertake the 

 difficult task of generalizing their innumerable facts. 



— Henry Collins has written an interesting little pamphlet on 

 ''The International Date Line" (Bardeen, Syracuse, 15 cents), 

 giving a chart of the line that runs irregularly through the 

 Pacific, and on either side of which the dates differ by a day. 

 Teachers will find it instructive; although a few matters of fact 

 might have been more fully ascertained before publication, as by 

 correspondence with consuls. The interesting point is raised: 

 Who first celebrate the New Year ? It is clearly shown that the 

 180° meridian from Greenwich has not the importance often 

 given it in the matter of changing dates. 



Bffspepsia 



Dr. T. H. Andrews, Jefferson 

 Medical College, Philadelphia, says 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 other 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 

 Rumford Cheniical Works. Providence, R. I. 



Beware of Substitutes and Imitations. 



For sale by all Druggists. 



[Fr 



Exchanges. 



charge to all, if of satisfactory character 



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



For Sale.— 4 new Model U. S. Army Hospital 

 Microscope (Zentmayer), also J^-inch and l^^-ineh 

 Objectives. HENEY C. WELLS, 151 Broadway, 

 New York. 



For sale or exchange. — A Stevens^ new model 

 pocket shot-gun, 44 cat., with 22-cal. rifle barrel. 

 Just the thing for collecting birds and small mam- 

 mals. "Will exchange for a ^-cal. cane-gun or good 

 books on ornithology. Write for particulars, stat- 

 ing what you have for exchange. B.C. McGREGOB. 

 S8« Champa st., Denver, Col. 



For sale.— A very fine stone sword (?) so named 

 by myself. It is perfect — 15 inches in length, a little 

 over 'Z inches in width, and J^ inch thick. It is of a 

 dark slate color, perhaps limestone, and is the 

 largest implement of the kind known. Some fifteen 

 years ago, when it was not mine. I was offered $40 

 for it; since that time it has come into my posses- 

 sion: that price will now buy it. Address Rev. C. 

 FOSTER WILLIAMS, Ashwood, Tenn. 



For exchange. — Fine specimens of Wis. fresh- 

 water pearls. I want books or papers on marine 

 and fresh-water alg» ; also classified specimens of 

 same. I will exchange for Smithsonian reports or 

 crystallized minerals. D. M. ANDREWS, Dodge 

 Centre, Minn. 



For Sale or Exchange.— The undersigned has a 

 lot of first-class duplicate bird's skins and sets of 

 eggs, both rare and common, tor sale or acceptable 

 exchange. Also about two hundred second class 

 skins and five hundred eggs, suitable for study 

 specimens, at very low figures. The latter, for 

 starting a collection, are as good as the best, e°^' 

 bracing all classes and nearly all families, Al^o 

 about forty species of fossils, principall'^ D^" 

 MOaRISQIBBS,M.D., Kalamazoo Mich- 



Wants. 



A 



POSITION is desired in the South, preferably 

 _ 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 

 family preferred, but will accent regular school 

 work if not too confining. MORRIS GIBBS, M.D , 

 Kalamazoo, Mich. 



WANTED.— By well - qualified and experienced 

 science master and associate of the Royal 

 School of Mines, London, aged 86 (at present ia 

 England), a mastership in 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. 



METALLURGICAL CHEMIST will give instme- 

 tion in the metallurgy and chemical analysis 

 of iron and steel. Complete or special courses ap- 

 plying to the manufacture of pig irons and steels, as 

 well as to their uses. Address " MET.iLLURGIST," 

 care Science. 



A GRADUATE of the University of Pennsylvania 

 and a practical mineralogist of twenty years' 

 experience desires to give his services and a cabi- 

 net of 25,(00 specimens, all named, with about the 

 same number of duplicates, in minerals, crystals, 

 rocks, gems, fossils, shells, archaji 'logical 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. 



CHEMIST AND ENGINEER, graduate Germaa 

 Polytechnic, Organic and Analytical, desires a 

 position in laboratory or chemical works. Address 

 21:33^ E. 7th Street. New York, care Levy. 



The American Geologist for 1893. 



Edited by Prof. S. Calvin. University of Iowa; Dr. E. W. Clatpole, Buchtel College; John Eteruan. 

 Lafayette College; Dr. Persifor Fraeek. Penn, Hort. Soe.; Prof. F. W. Cragin. Colorado College; 

 Prof. Rob't T, Hill, U. S. Irrigation Survey; Dr. Andrew C. Lawson. University of California; Frank 

 D. Knowlton, U. S. National Museum; Joseph B. Tirrell. Geol. Sur.of Canada; E. O. Ulrich. Minnesota 

 Geological Survey; Prof. I. C. White. University of West Virginia; Prof. N. H. Winchell, University 

 -.< ?iii„„.=„f„ v„„ i„ it„ -v,!, „„i gg 59 p^r year. Sample copies. 30 cents. Address 



of Minnesota 



its Xth volu 



THE GEOLOGICAL PUBLISHING CO., MinneapoUs, Minn. 



