SCIEN 



[Entered at the Post-Offlce of New York, N.Y., as Second-Clasa Matter.J 



Ninth Year. 

 Vol. XVIII. No. 443. 



NEW YOKK, July 31, 1891. 



Single Copies, Ten Cents. 

 3.50 Per Year, in Advance. 



New Method of Protecting Property 

 from Ligtitning. 



The Lightning Dispeller. 



Price, $20 to $30.— According to size. 



The Patent Lightning Dispeller is a conduc- 

 tor specially designed to dissipate the energy 

 of a lightning discharge, — to prevent its 

 doing harm, — placing something in its path 

 upon which its capacity for causing damage 

 may be expended. 



No recorded case of lightning stroke has 

 yet been cited against the principle of the 

 Dispeller. So far as known, the dissipation 

 of a conductor has invariably protected under 

 the conditions employed. 



Correspondence solicited. 



AGENTS WANTED. 



The Aierican Liglitning Protection Company, 



Sioux City, Iowa. 



MIMEPAIC Cabinet Specimens. Collections. 

 IfllllCnHLui For Blowpipe Analysis. 



Largest and finest stock in U. S. 100pp. Illustrated 

 Catalogue, paper^ bound, 15e ; cloth bound, 25c. 

 GEO. L. ENGLISH & CO, Mineralogists. 

 Removed to 733 & 735 Broadway, New York. 



Conrse of Mineralogy for Young People. 



Third Grade ready, containing directions how to 

 study minerals by means of blowpipe analysis. 



Book, Collection, Correspondence one dollar 

 postage, '2r> cents. Address 



GUSTAVE GUTTENBERG, 

 Central High School, Pittsburgh. Pa. 



WALKER PRIZES IN NATURAL HISTORY. 



The Boston Society of Natural History 



offers a first prize of from $60 to $100, and a second 

 prize of a sum not exceeding $50, for the best me- 

 moirs, in English, on one of the following subjects: 



1. An original investigation into any of the prob- 

 lems connected with the geology of thelast ice epoch 

 in New England; any of the glacial features, as, for 

 instance, the distribution and history of morainal 

 deposits and eskers, or of sand plains may be se- 

 lected. 



2. An original investigation into the recent changes 

 of level of the whole or of a part of the shore line of 

 the eastern United States. This inquiry must in- 

 clude observations on and discussions of the phe- 

 nomena exhibited by elevated sea margins and sub- 

 merged forests. 



3. A study of any river valley in New England 

 containing an area of not less than one hundred 

 square miles; the inquiry to include the pre^lacial 

 history of the stream, the changes effected in the 

 basin by the last ice epoch, the relation of the valley 

 to the neighboring basins, and to changes of level of 

 the sea. 



Each memoir must be accompanied by a sealed 

 envelope, enclosing the author's name and super- 

 scribed by a motto corresponding to one borne by 

 the manuscript, and must be handed to the Secre- 

 tary on or before April 1st, 1892. 



Prizes will not be awarded unless the memoirs are 

 deemed of adequate merit. 



For further particulars apply to 



' SAMUEL DEXTER, Secretary. 



Boston, July 1, 1891. 



PATENTS 



For INVENTORS. 40-page BOOK FREE. Address 

 "W. T.Fitzgerald, Attorney at Law, Washington, D.C. 



D R TCMTO J- B. CRALLE & CO., 



r H I tn I Washington, D. C. 



ILLUSTRATED HAND-BOOK FREE upon applica- 

 tion. Mention this paper. 



PROTECTION FROM LIGHTNING. 



All the capital desired for the parent company 

 to handle my patents on a new method of protect- 

 ing buildings from lightning has been subscribed. 

 Sub-companies and agencies to introduce the 

 mvention are forming, and any desirous of tak- 

 ing State-rights should address The American 

 Lightning Protection Co., Sioux City, Iowa. 



The English patent is for sale, and offers 

 an excellent opportunity for the formation of a 

 company now that the American company is so 

 favorably started. 



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



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. No response 

 to date. 



N. D. C. HODGES, 



47 LAFAYETTE PLACE, 

 ISTEA^ YORK. 



On Jan. 1st, and at intervals of two months 

 since, has been published the New Zealand 

 Journal of Science, dealing with all branches 

 of natural science, especially in relation to 

 the colony. Subscription (including postage 

 to America), 12s. M. per annum, payable to 

 the Editor, care Matthews, Baxter & Co., 

 DowlingSt., Dunedin, N. Z. 



