October 20, 1893,] 



SCIENCE. 



223 



proved statements of the same principles by later writers 

 are traced in a very interesting manner. The progress 

 made in the production of a science of dynsmics is sim- 

 ilarly exhibited, and the methods of exposition and proof 

 adopted by Galileo, Newton, Huygens and the latter 

 mathematicians are compared in a most instructive discus- 

 sion. The construction of the science of mechanics, as 

 now defined by the mathematician, is traced historically 

 and logically, and this discussion is closed by a very sug- 

 gestive chapter on the economy effected by the precision 

 of thought and expression which the science of mechanics 

 illustrates and promotes. The closing chajster on the re- 

 lation of this science to other departments of learning is 

 pecularly interesting, and is the only approach to met- 

 aphysical treatment in the book of any branch of the sub- 

 ject. A table of titles of the works of the great writers 

 to whose treatises reference has been made is a valuable 

 feature. The book will interest every mathematician. 



The Locomotive Catechism. By Eobekt Grimshaw. Spon 

 & Chamberlain, New York. 362 p. 12mo. $2.00. 

 This is one of those useful little books which are fre- 

 quently supplied the artisan with the intention of giving 

 him "practical" information in the most thoroughly pep- 

 tonized form. .The catechetic form is given the work in 

 order that every idea may be distinctly grasped and ques- 

 tion and answer imjjressed upon the mind permanently. 

 It is a kind of book which is often much derided ; but 

 there is no question in the minds of those most familiar 

 with their field, that they are well adapted to the use of 

 the class of slow readers and inexperienced students to 

 whom they are addressed. Their extensive sale and the 



fact that an author and his publishers venture to bring 

 into the market a new work in a field already so long and 

 so well occupied by the older and more familiar " For- 

 ney's Catechism of the Locomotive " are sufiicient proof of 

 a call for them. This little book is full of valuable infor- 

 mation for the locomotive driver and his fireman, and for 

 all who are interested in the steam-engine and its con- 

 struction, even though not professionally. It is freely il- 

 lustrated and will probably find extensive sale. 



Outlines of Surveying and Navigation, for Public Schools 

 and Private Study. By James Pitcher, A.M. Syracuse, 

 N. Y. C. W. Bardeen, 1893. 34 p. 12mo. 50 cents. 

 This litile book is intended to be used as a primer " to 

 give the learner a brief outline of one of the most useful 

 and delightful of occupations." It gives the elementary 

 mathematical theory of the subject, and by the aid of the 

 most elementary mathematics. The book is prepared " for 

 the fireside as well as the school," and will probably find 

 many interested readers and students among the boys on 

 the farm, as well as among scholars in the high schools. 

 The text is well expressed, the examples well chosen, and 

 the illustrations satisfactory. The author concludes : 

 " The foregoing pages have been prepared in the hope of 

 contributing something to the increased intelligence of 

 the boys and girls of our State and nation. Intelligent 

 patriotism and piety will insure She success and the sta- 

 bility of our government " ; and he apjaends Washington's 

 " Farewell Address " as the best lesson in patriotism. 

 "Were all books written by authors of the same spirit and 

 of equal patriotism, our boys would profit by the fact 

 greatly, and our country gain commensiu'ately. 



Indigesfm 



Horsford's Acid Phosphate 



Is the most effective and agreeable 

 remedy in existence for preventing 

 indigestion, and relieving those dis- 

 eases arising from a disordered 

 stomach. 



Dr. "W. W. Gardner, Spring- 

 field, Mass., says, "I value it as an excel- 

 lent preventative of indigestion, and a 

 pleasant acidulated drink when proper- 

 ly diluted with water, and sweetened." 



Descriptive pamphlet free on application to 



RuMFORD Chemical Works, Providence, R. I. 



Beware of Subsi itutes and Imitations. 



For sale by all Druggists. 



Exchanges. 



[Free of charge to all, if of satisfactory character. 

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

 York.] 



Would like to exchange 100 specimens of Canadian 

 Indian Relics for a photo outfit. E. T. Waters, ^5 

 Hoffman St., Auburn, N. Y. 



« „. Sale.— A collection of fossil Rhinoceros bones 

 (Aphelops fossiger Cope.) from the Loup Fork Ter- 

 tiary, including all the bones of one fore and one 

 hind leg, the pelvis, representative vertebrae and 

 ribs, and a nearly complete skull, with complete 

 lower jaws. All the bones of the limbs are perfect. 

 Price $250. Address Dept. of Paleontology, Uni- 

 versity of Kansas, Lawrence. 



For Exchange.— Books and pamphlets on geology, 

 ornithology, conchology, and entomology. State 

 what line and I will send list. I want Odonota from 

 any locality, aid literature on this group. M J 

 Eh-od, 111. Wes. Univ., Bloomington, 111. 



For Sale.— The remains of three individuals, one 

 young and two adult, of Elephas Americanus 

 found in Jasper Co., Mo. The remains comprise 

 most of the skeletons, and comparatively little res- 

 toration would have to be done. The bones are in 

 a good state of preservation and have not been 

 worked out. For terms and further information 

 address E. O. Hovey, 239 Center St., New Haven, 

 Conn. 



Bird skins scientifically prepared, with full data, 

 in exchange for species from the U. S. not in my 

 collection. Horace G. Smith, 2918 Lafayette St., 

 Denver, Colo. 



For Sale.— Holmes' System of Surgery by Packard. 

 3 vols., calf, 1881, new, for $15.00. (regular price, 

 $21.00). Hares's System |of Practical Therapeutics. 

 3 vols., calf, 1891, new, for $12.90. (regular price, 

 518.00.) Dr. Ashmead, 45 Macdougal.St., New York. 



Wards. 



U/ ANTED.— A copy of Mascart & Joubert's Les- 

 " * sons in Electricity and IVIagnetism, Vol. I. Ad- 

 dress R. W. Clawson, \'anderbilt University, Nash- 

 ville, Tennessee. 



pHEMIST.— Graduate of a polytechnical school, 

 ^-^ and studied photographic chemistry in Ger- 

 many and Austria. Situation teaching or in ana- 

 lytical or experimental laboratory. M. B. Punnett, 

 Rochester, N. Y. 



\X^ANTED.— A recent college graduate to assist in 

 '" editorial work on Science. Those seeking 

 large emoluments need not apply. N. D. C. 

 Hodges, 874 Broadway, New York. 



A GRADUATE in medicine, experienced, will 

 '^ prepare or revise scientific and medical manu- 

 script for publication, read proof, compile bibliog- 

 raphies, &c. Will also consult New York libraries 

 for persons out.of town wishing references to rare 

 works. Address M. D., 104 Cambridge Place, 

 Brooklyn, N. Y. 



pOR SALE.— Volumes V. and VI. of the "Explor- 

 1 ations for a Railroad Route from the Missis- 

 sippi River to the Pacific," 1S57, half calf, in good 

 condition; a large number of colored and uncolored 

 plates of Mammals, Birds, Fish, etc., etc. On 

 receipt of $7.00 will send to any ordinary point in 

 the U. S., express paid. These volumes are now 



A Y'OUNG woman who has been an assistant for 

 '^ a literary and scientific man desires a similar 

 position. Is an experienced and accurate stenog- 

 rapher and typevn-iter, thoroughlv educated, and 

 sufliciently familiar with literary work to write, in- 

 dependent of dictation. Has some knowledge 

 of the Spanish language. Will go to any part of the 

 United States. Address, Box 147, Ravenna, Ohio. 



