May 9, 1890.] 



SCIENCE. 



295 



tain branches or divisions and subdivisions of that science. Some 

 ot tlie more recent electrical works, therefore, are devoted to 

 dynamo-electric machines, for instance, or to secondary batteries, 

 or to molors; while the electrical treatises of a few years ago, 

 almost -without exception, aimed to cover the whole field of the 

 science as far as it was developed at that time. The volume be- 

 fore us is a good example of this tendency toward specialization, 

 and an equally good example of the coDiprehensive method of 

 treatment followed in the earlier works on electricity. It is de- 

 voted wholly to the subjpct of electric lighting, and it covers that 

 field so thoroughly that it leaves little to be desired in the way of 

 information by either artisans or students. 



One of the authors, Mr. Slingo, is principal of the Telegraphists' 

 School of Science, and director of the Electrical Engineering Sec- 

 tion of the People's Palace, London ; and the other, Mr. Brooker, 

 is instructor in electrical engineering in both the institutions men- 

 tioned. Having felt the necessity, in the course of their labors, 

 for a single work covering the whole field of electric lighting, 

 and not finding such a treatise ready to hand, they set to work 

 to fill the gap in electrical literature, and the volume before us is 

 the result. The book, though specially designed to fill a pre- 

 determined place in the course at the institutions named above, 

 also embraces in its scope the requirements of those actually en- 

 gaged in the electric-lighting industry, as well as those of persons 

 who, with little or no electrical knowledge, have under their 

 supervision various kinds of electrical machinery. It will there- 

 fore be of service to managers of mines and factories, naval 

 officers, and to all engineers who may at any time be brought 



into contact with an electric-lighting plant. The book is illus- 

 trated by upwards of three hundred engravings. 



A Natural Method of Physical Training. By Edwin Checkley. 

 Brooklyn, W. C. Bryant & Co. 16°. p.M. 

 The method of training advocated and taught in this little vol- 

 ume appeals at once to the good sense of the reader. It requires 

 no machinery or apparatus of any kind, except, of course, the 

 bones and muscles of the person training; and it may be taken 

 up and pursued at any time and In any place, either with or 

 without" an instructor. The aim is not to produce champion 

 rowers or boxers or sprinters, nor even to develop good ' ' all- 

 round " athletes, but to do for the body what education does for 

 the mind. The aim is to put the body into the best possible con- 

 dition for doing the work it has to do, and to keep it in that con- 

 dition. The author believes that there is more "straining" than 

 "training" in some of the popular systems of jshysical training 

 practised in and out of the college gymnasium, and his method 

 departs radically from those systems in many respects. But we 

 find nothing in it that physicians could take exception to in the 

 case ot any person physically sound. The book is fully illus- 

 trated, many of the engravings being made from instantaneous 

 photographs of the author in the different positions afsumed in 

 the course of training. 



The Atlantic Monthly for June will contain an article by 

 Charles Dudley Warner, entitled " The Novel and the Commori 

 School," a pedagogical essay on reading and reading-books. 



I took Cold, 



I took Sick, 



I TOOK 



EMULSION 



I take My Meals, 



I take My Rest, 



AND I AM VIGOROUS ENOUGH TO TAKE 

 ANYTHING I CAN LAY MY HANDS ON ; 



getting lUt loo, FOR Scott's 

 Emulsion of Pure Cod Liver Oil 

 and Hvpophosphitesof Limeand 



Soda >^0T ONLY CURED MV IllCIp- 



ieiit ConsiiiiiptioiB but built 



ME UP, AND IS NOW PUTTING 



\ FLESH ON MY BONES 



i AT THE RATE OF A POUND A DAY. T 

 j TAKE IT JUST AS EASILY AS I DO MILK." 

 ! SUCH TESTIMONY IS NOTHING NEW. 

 j SCOTT'S EMULSION IS DOING WONDERS 



( DAILY. Take no other. 



GEMS AND PRECIOUS STONES OF 

 NORTH AMERICA: 



A popular description of tlieir occurrence, value, 

 history, archseology, and of the collections in 

 which they exist; also a chapter on pearls, and on 

 remarkable foreign gems owued in the United 

 States. By George Frederick Kunz. Illustrated 

 with eight colored plates and numerous engrav- 

 ings. Price, SIO. 

 Mr. Kunz, who is well known as an authority upon 



the subject of gem stones, and who is the expert for 



Tiffany & Co., possesses peculiar facilities for the 



preparation of a work of this kind. 



Sent postpaid on receipt of price. 

 N. D. C. HODGES, 47 L,afayette PI., N. Y. 



A New Method. of Treating Disease. 



HOSPITAL REMEDIES. 



What are they ? There is a new departure in 

 the treatment of disease. It consists in the 

 collection of the specifics used by noted special- 

 ists of Europe and America, and bringing them 

 within the reach of all. For instance, the treat- 

 ment pursued by special physicians who treat 

 indigestion, stomach and liver troubles only, 

 was obtained and prepared. The treatment of 

 other physicians celebrated for curing catarrh 

 was procured, and so on till these incomparable? 

 cures now include disease of the lungs, kidneys, 

 female weakness, rheumatism and nervous de- 

 bilily. 



This new method of "one remedy for one 

 disease" must appeal to the common sense of 

 all sufferers, many of whom have experienced 

 the ill effects, and thoroughly realize the ab- 

 surdity of the claims of Patent Medicines which 

 are guaranteed to cure every ill out of a single 

 bottle, and the use of which, as statistics prove, 

 /tas ! tiined moj'e stomachs than alcohol. A cir- 

 cular describing tliese new remedies is sent free 

 on receipt of stamp to pay postage by Hospital 

 Remedy Company, Toronto, Canada, sole pro 

 prietors. 



THIRD EDITION. 



THE FAULtToF speech 



BY 



A. MELVILLE BELL, 



Author of " Visible Speech,'" etc., etc. 



The Faults of Speech is a Self -Corrector 

 and Teacher's Manual, for the removal of all 

 Impeditoents and Defects of Articulation. 



60 C©3=L-bS- 



*:s,* Sent postpaid on receipt of price, 



N. D. C. HODGES, 47 Lafayette Place, 



NEW YORK. 



BOOKS: HoAT to get tbem. If there is any 

 book or pamphlet that you want, write to the Science 

 Book Agency, 47 Lafayette Place, New York. 



BOOKS : Hovr to Excbange ttacm for 

 others. Send a postal to the Science exchange 

 column (insertion free), stating briefly what you 

 want to exchange. Science, 47 Lafayette Place; 

 New York. 



SECOND EDITION. 



NATURALISTIC PHOTOGRAPHY 



FOK STBJBENTS OF THE ART. 

 313 pages Sro., cloth, S2.C0, i:osia(;e prej.md 

 " This book contains a greater amount of infoima 

 tion on the artistic elements to be considered in 

 photography than any that we know of.''''— Scientific 

 American. Descriptive circulars on application to 

 E. & F. N. SPON, 12 Cortlandt St., New York. 



Wants. 



Aiiv person seeking a position /or 'which he is qttali' 

 fi-ed by his scientific atiainmeii*s, or any person seekitig 

 some 07ie to fill a position of this character^ be it thai 

 o/ a teacher o/ science^ chemist^ drajightsuian, or ivhai 

 not, may have the ' IFant^ inserted under this head 

 FREE OF COST, if he Satisfies the publisher of the suit- 

 able character of his application. Any person seeking 

 in/onnation on any scie7itific question, the address (?/ 

 any scientific jnan, or -who can in any ivay use this col" 

 umn for a purpose consonant -with the nature ofi the 

 paper, is cordially invited to do so. 



A SSAYER.— Wanted position as above, has had 

 three years' practical experience in a London 

 firm of assayers to the Bank of England, Royal Mint, 

 etc., etc. Through knowledge of bullion assaying, 

 andof gold, silver and lead ores. I. FRED. JOHN- 

 SON, Northgate Brewery, Canterbury England. 



WANTED— Two first-class Instrument Makers. 

 Apply by letter to T. C. MENDENHALL. Su- 

 perintendent United States Coast and Geodetic 

 Survey, Washington, D.C. 



AN EXPERIENCED Technical Chemist will be 

 open to engagement this summer. Highest ref- 

 erences. Address DIRECTOR. Office of Science. 



ELECTRICITY.— A young man with a knowledge 

 of electricity and a taste for journalism can 

 learn of an opening by addressing Science, 47 Lafay- 

 ette Place, New York. 



PROF. WILLIAM FINDLAY, of the Philadelphia 

 Institute of Physical Culture, is open to engage- 

 ment in summer school to teach Free Movements, 

 Wands, Clubs, Dumb-bells. Fencing and Sparring. 

 Address 1,009 Arch St., Phila., Pa. 



W' 



/ANTED —A position in an Academy, Normal or 

 High School, as teacher of the Natural Sciences 

 d Modern Languages. Latin taught in addition if 

 cessary. Address G., Box 144, Hanover, N. H. 



WANTED— One or two persons with some means 

 interested in Archteology to accompany a re- 

 liable antiquarian to Southern Ohio for four months' 

 work in the mounds. The specimens found to be 

 shared equally. Forterms address W. K. M.. Box 148, 

 Smithsonian Institute. Washington, D. C. 



