266 



SCIENCE. 



[Vol. XXI. No. 536 



THE 



lell Te 



COMPANY. 



98 MILK ST., BOSTON, MASS. 



This Company owns the Letters - Patent 

 No. 186,787, granted to Alexander Graham 

 Bell, January 30th, 1877, the scope of which 

 has been defined by the Supreme Court of 

 the United States in the following terms : 



' ' The patent itself is for the mechanical 

 structure of an electric telephone to be used 

 to produce the electrical action on which the 

 first patent rests. The third claim is for the 

 use in such instruments of a diaphragm, 

 made of a plate of iron or steel, or other ma- 

 terial capable of inductive action ; the fifth, 

 of a permanent magnet constructed as de- 

 scribed with a coil upon the end or ends 

 nearest the plate ; the sixth, of a sounding 

 box as described ; the seventh, of a speaking 

 or hearing tube as described for conveying 

 the sounds; and the eighth, of a permanent 

 magnet and plate combined. The claim is 

 not for these several things in and of them- 

 selves, but for an electric telephone in the 

 construction of which these things or any of 

 them are used." 



This Company also owns Letters-Patent 

 No. 463,569, granted to Emile Berliner, No- 

 vember 17, 1891, for a combined Telegraph 

 and Telephone, ,and controls Letters-Patent 

 No. 474,231, granted to Thomas A. Edison, 

 May 3, 1892, for a Speaking Telegraph, 

 which cover fundamental inventions and 

 embrace all forms of microphone transmit- 

 ters and of carbon telephones. 



BUSINESS OPPORTUNITY. 



There is an opening for a 

 young man to open a New 

 York office of the American 

 Lightning Protection Co., 

 operating under my patents. 

 But little capital will be re- 

 quired. 



N. D. C. HODGES, 



874 BROADWAY, NE W YORK 



THE RA.DIOMETER. 



By DANIEL S. TROY. 



This contains a discussion of the reasons 

 for their action and of the phenomena pre- 

 sented in Crookes' tubes. 



Price, postpaid, 50 cents. 



N, D. C. HODGES, 874 Broadway, K. Y, 



MINERALS '"-'sTo'cK. 



Send for our " Winter Bulletin," recently issaed. 

 Minerals, Gems, Microscopical Sections, Fine Lap- 

 idary Work. 



GEO. L. ENGLISH & CO,, Mineralogists, 



Removed to 64 East 12th Street, New York, 



Fact and Theory Papers] 



I. THE SUPPRESSION OF CON- 



SUMPTION. By GODFREY W. Hambleton, M.D. 

 12°. 40c. 



II. THE SOCIETY AND THE " FAD." 



By Appleton Morgan, Esq. 13°. 20 cents. 



III. PROTOPLASM AND LIFE By 

 C. F. COX. 12°. 75 cents. 



IV. THE CHEROKEES IN PRE-CO- 



LUMBIAN TIMES. By Ctkus THOMAS. 12°. $1. 



V. THE TORNADO. By H. A. Hazen. 



12°. $1. 



VI. TIME-RELATIONS OF MENTAL 



PHENOMENA. By JOSEPH JASTROW. 12°. 50c 



VII. HOUSEHOLD HYGIENE. By 



Maet Taylor Bissell. 12°. 75 cents. 



N. D. C. HODGES, Publisher, 



874 Broadway, New York. 



THE MODERN MALADY; or, Suf- 

 ferers from ' Nerves.' 



An introduction to public consideration, 

 from a non-medical point of view, of a con- 

 dition of ill-health which is increasingly 

 prevalent in all ranks of society. In the 

 first part of this work the author dwells on 

 the errors in our mode of treating Neuras- 

 thenia, consequent on the wide ignorance of 

 the subject which still prevails; in the sec- 

 ond part, attention is drawn to the principal 

 causes of the malady. The allegory forming 

 the Introduction to Part I. gives a brief his- 

 tory of nervous exhaustion and the modes of 

 treatment which have at various times been 

 thought suitable to this most painful and try- 

 ing disease. 



By CYRIL BENNETT. 



12°, 184 pp., $1.50. 



N. D. C. HODGES, 874 Broadway, N, 



POPULAR MANUAL OF VISIBLE SPEECH AND 

 VOCAL PHYSIOLOGY. 



For use in Colleges and Normal Schools. Price 50 cents 

 Sent free by post by 



N. D. C. HODQES, 8 74 Broadway, N. Y. 



QUERY. 



Can any reader of Science cite 

 a case of lightning stroke in 

 which the dissipation of a small 

 conductor (one-sixteenth of an 

 inch in diameter, say,) has failed 

 to protect between two horizon- 

 tal planes passing through its 

 upper and lower ends respective- 

 ly? Plenty of cases have been 

 found which show that when the 

 conductor is dissipated the build- 

 ing is not injured to the extent 

 explained (for many of these see 

 volumes of Philosophical Trans- 

 actions at the time when light- 

 ning was attracting the attention 

 of the Royal Society), but not 

 an exception is yet known, al- 

 though this query has been pub- 

 lished far and wide among elec- 

 tricians. 



First inserted June 19, 1891. No re- 

 sponse to date. 



N. D. C. HODGES, 874 BROADWAY, N. Y. 



SCIENCE CLUBBING RATES. 



105^ DISCOUNT. 



We will allow the above discount to any 

 subscriber to Science who will send us an 

 order for periodicals exceeding $10, counting 

 each at its full price. 



N. D. C, HODGES, 874 Broadway, N. Y. 



"BUSY FOLKS' GYMNASIUfl." 



A few minutes' daily exercise 

 on our fascinating apparatus 

 clears the brain, tones up the 

 body, develops weak parts. Our 

 cabinet contains chest- weights, 

 rowing-weights, lifting-weights, 

 clubs and dumb bells, adjust- 

 able for old and young. It is 

 the only complete exercising outfit 

 in the world suitable for use in 

 living rooms. All prices. You 

 can order on approval. Chest 

 machine separate, $4.50 and up. 

 Educated agents wanted. Physi- 

 cal Culture Chart, with illustrated directions for de- 

 every part of the body healthfully, 50 cts. Sent for half price to those 





fjood fo 



veloping 



naming this paper. 



WHITNEY HOME GYMNASIUM CO., Box D., Rochester, N. Y. 



