'December 30, 1892.] 



•SCIENCE. 



Z71 



hypotheses which best explain Ihem. The more important for- 

 mulas of differential and integral calculus are deduced in an early 

 chapter (of only 15 pagfs) on "varying quantities." This is 

 well written for review, but less adapted to the student who is un- 

 familiar with calculus. The next chapter discusses vectors, com- 

 position of motion or velocities, harmonic motion, etc., as pre- 

 liminary to mechanics, gravitation, and the properties of matter. 

 While the phenomena and the laws of sound, light, heat, and 

 electricity are taken up in succession, the essential unity and in- 

 terdependence of the several subjects are kept in view. Thus 

 many of the terms and formulas which we usually associate with 

 statical electricity are discussed in connection with gravitation. 



Among the interesting topics are Thomson's hypothesis of 

 vortex atoms, Maxwell's electro-magnetic theory of light, and the 

 several theories of ether. 



References to original papers, and problems to be solved by the 

 student, might have been desirable features, but would have in- 

 creased the size of the volume. A very large range of physical 

 science is comprised within moderate space; and this is confidently 

 recommended to those who enter into the beauties of mathemati- 

 cal thought. ROBT. B. Warder. 



The Woodworkers' Manual. By C. R. Tompkins, M.E. The au- 

 thor, Dover, N.H. 

 This is a pamphlet of sixty pa^es containing a condensed ac- 

 • count of the machinery and processes of woodworking, by an 

 author evidently practically familiar with the subject. He gives 

 a plain and simple account of the best practical methods of plan- 

 ning and building the woodworking " plant" and of placing its 

 machinery. The mostusual and standard forms of woodnorking 

 ■machinery are described, and " practical instructions for the 

 care, management, and preservation of the machinery" are given. 

 Illustrations of the tools employed are also given. The paper is 

 iprinted in good style, ami it would be worth while, one would 

 think, to doub'e its extent and bind it up. Tw good sense of 

 ■the authai is teen in his remarks about the use of lubricants. 



He thinks that there is " no economy in saving five dollars on the 

 price of a barrel of oil, and losing ten dollars, In consequence of 

 its u*e, in extra repairs; which is in most cases a fact." 



AMONG THE PUBLISHERS. 



Professor E A. Smith, State Geologist of Alabama, has re- 

 cently published a '■ Sketch of the Geology of Alabama." In it 

 are given descriptions of the various geological formations out- 

 cropping, with mention of the economic products found in them. 

 In this regard the most valuable rocks are the crystalline schifts 

 of Archfean age, and the Coal Measures. From the former are 

 derived many varieties of minerals and from the latter large 

 amounts of coal. The Clinton or Red Mountain formation is 

 also of value for the large quantity of iron ore it contains. The 

 formations occurring in the State and treated of with more or 

 less fullness, are Archeean, Cambrian, Silurian, Devonian, Car- 

 'boniferous, Cretaceous, Eocene, Miocene, Pliocene (?), Pleisto- 

 cene, and Recent. The pamphlet will prove useful to geologists 

 in general and the citizens of Alabama in particular. 



— Professor Merwin-Marie Snell, who is one of the few spe- 

 cialists in comparative religion to be found in the United States, 

 and who has lieen iiuo.vn for some years as a writer and lecturer 

 on that and other antiiropological subjects, has recently severed 

 his connection with the University at Washington, for the pur- 

 pose of giving his attention to the conducting of a magazine de- 

 voted to the comparative history of religions and the archaeology, 

 philology, history, philosophy, religion, and literature of the 

 Asiatic peoplps. The leading specialists of Europe and America 

 will be found among the contributors, but it is intended to give 

 the periodical enough of a popular character to make it acceptable 

 to the general reader as well as to the serious students of the 

 sciences concerned. The name of the magazine will be The 

 Oriental Review. It will be a bimonthly, with a subscription 

 price of two dollars a year The publication office is at 2,138 H 

 Street, N. W., Washington, D. C. 



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 

 Riimford Chemical Works. Providence, R. I. 



Beware 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 



For exchange — Minerals, fossils, P. 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 S700 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, Tusford, Newark, 

 England. 



The Biological Department of Hamline University 

 desires to offer micrt'scopic slides of animal tissues, 

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

 Address corresp-^ndence to Henry L Osborne, Ham- 

 line University, Hiunliue, Minn. 



For sale.— A set of the Berichte der Deutschen 

 Cbemischen Gesellscaft, from Jan. 1. 1877, to .Jan. 1 

 1892, bound in twenty-six volumes to Jan. 1, 18H8 

 and remaining four years unbound. Also the Bulle 

 tin de la Societe Chemique de Paris, from Jan. 1 

 1879, to Jan. 1, 1892, bound in eighteen volumes to 

 Jan. 1, 1S88, and remaining four years unbound. 

 Dr. Marcus Benjamin, care of D. Appleton & Co., 

 1 Bond St., New York City. 



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

 Microscope (Zentmaver). also H'uch and ]y>-inch 

 Objectives. HENRY C. WELLS, 151 Broa"lway. 

 New York. 



Wants. 



WANTED.— American Journal of Conchology, 

 seven volumes. Parties having these for 

 sale will please address the undersigned, stating 

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



A GRADUATE ENGINEER will give instruction 

 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. 



\ POSITION is desired in the South, preferably 

 ^'\ the Gulf States, where 1 can teach ihe sciences 

 Can also itstruct in other branches. Salary only 

 nominal, as 1 am simply desirous of employment 

 while spending the winter in the South. A private 

 family preferred, but will acceot regular school 

 work 'if not too confining. MORRIS GiBBS, M.D , 

 Kalamazoo, Mich. 



\1 7 ANTED. — By well - qualified and experienced 

 W science master and associate of the Royal 

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

 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. 



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 25,100 specimens, all named, with about the 

 same number of duplicates, in minerals, crystals, 

 rocks, gems, fossils, shells, archaeological and etlino- 

 logical specimens and woods to any institution de- 

 siring a fine outht for study. The oA'ner 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. 



The American Geologist for 1893. 



Edited by Prof. S. Cal«n, University of Iowa; Dr. E. W. Claypole. Buchtel College: Johx Eteemax. 

 Lafayette College ; Dr. Persifor Frazer. Penn. Ilort. Soc; Prof. F. W. Cragin. Colorado College: 

 Prof. Rob't T. Hill, U. S. Irrigation Survey; Dr. A.ndrew C. Lawsok. University of California; Frank 

 D.Knowlton, U.S. National Museum; .Toseph B. Tyrrell. Geol. Sur.ot Canada; E. O. Ulrich. Minnesota 

 Geological Survey; Prof. 1. C. vVhite. University of VVest Virginia; Pr.if. N. H. Wikchell. University 

 of Minnesota. Now in its Xth voUiiue. S:i nO per year. Sample copies. 20 cents. Address 



THE GEOLOGICAL PUBLISHING CO.. Minneapolis. Minn. 



