SCIENCE 



lEntered at the Post-Offlce of New York, N.Y., as Second-Class Matter.J JV fn^^ 



Ninth Year. 

 Vol. XVII. No. 435. 



NEW YORK, June 5, 1891. 



Single Copies, . '7 Jents. 

 3.50 Per Year, in advance. 



The attention of 



Tourists and Botanists in Field Work 



is called to a 



SPECIAL EDITION OF 



GRAY'S MANUAL OF BOTANY, 



JUST ISSVEn. 



In response to many requests from Botanists, the publishers 

 have prepared a special edition of thits work, on thin, tough 

 paper ; bound in full leather, with limp sides, cut flush. It is in- 

 tended for the packet and satchel, and will stand rough usage. 

 Price, $2.oo. 



GRAY'S MAHUAL OF BOTAUY 



of the Northern United States. Including the District East of the Mississippi and North 

 of North Carolina and Tennessee. Sixth Edition, Revised and extended westward to 

 the one-hundredth meridian by Sereno Watson, Curator of the Gray Herbarium, Harvard 

 TTniversity, and John M. Coulter, Professor of Botany in "Wabash College, assisted by 

 specialists in certain groups. With twenty-five plates, illustrating the Sedges, Ferns, 

 etc. Gray's Manual is so widely known and generally used in the scientific schools and 

 colleges of the country that it is hardly necessary to describe it more fully than to indi- 

 cate its scope as above. Either with the Lessons previously mentioned, or with the 

 Structural Botany it forms a complete course for higher classes or the general student. 

 Cloth 8vo, 828 pages, and 25 plates. Price, $1.62. 



Boflides the above, the American Book Company publish standard and oopalar 

 botanical text books by such well-known educators and scientists as Bentley, Coulter, 

 Gray, Goodale, Herrick, Hooker. Steele, Wood, and Youmans, forming a library of 

 about 25 volumes. Descriptive pamphlets and complete price-list sent free on applica- 

 tion. Correspondence cordially invited. 



American Book Company, 



NEW YORK. 



CINCINNATI. 



CHICAGO, 



PROTECTION FROM LIGHTNING. 



PRSOPECTUS. 



47 Lafayette Place, New York, March 9, 1891. 



It is proposed by the owners of letters patent dated Dec. 16, 1890, on an improved 

 method for protecting buildings from lightning, etc., to organize a company for the hand- 

 ling of said patent and all improvements ; and subscriptions are requested on the following 

 terms and conditions : — 



1. A company is to be organized with a capitalization of $10,000, in 1,000 shares of $10 

 each, fully paid in at par, the company to be organized in such State as the subscribers may 

 determine by vote when all shares have been subscribed for, and with a charter to contain 

 a provision that the amount of capitalization shall never be increased. 



3. This $10,000 is to be used as working capital; and the object of the company will 

 simply be to place licenses with responsible persons, corporations, or sub-companies, al 

 such rates of royalty as may be agreed upon by a majority vote. 



3. In lieu of any stock or cash payment to the inventor for his patent, the inventor 

 will give said company the exclusive control of his said inventions in consideration of the 

 payment to him by said company of one-third of the gross royalty receipts. 



The officers of the company shall be elected by a majority vote of the stockholders 

 without reserve. No stock shall be given to anybody for services or any thing else except 

 actual cash payment at par into the treasury. 



No subscriptions will be binding until the full number of 1,000 shares has been sub- 

 scribed for. 



Subscriptions are solicited in amounts from five shares upwards. The list opens with 

 subscriptions for one hundred and filty-live shares. 



The names of those who have subscribed will be sent to any intending subscriber upon 

 application. 



N. D. C. HODGES. 



The 



Remington 



has set the copy for writing 

 machines for 15 years. 

 It is to-day the 



Standard 



and expects in the future, 

 as it has in the past, 

 to lead all others 

 in adding improvements 

 to what will always be 

 the true model of a 



Typewriter. 



Wyckoff, Seamans S^ Benedict, 

 327 Broadway, New York. 



Protection from Lightning 



To dissipate the energy of a lightning dis- 

 charge, — to prevent its doing harm, — it is 

 necessary that something should be placed in 

 its path upon which its energy (capacity for 

 causing damage) may be expended. The 

 Patent Lightning Dispeller is specially de- 

 signed to serve this purpose, and will be 

 sent prepaid, with full directions for its ap- 

 plication, to any part of the United States on 

 receipt of $.5.00. 



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 



N. D. C. HODGES, 



47 Lafayette Place, N. Y. 



MIMCDAIC Cabinet Specimens. Collections. 

 llllllLnflLui For Blowpipe Analysis. 



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

 Oatalogue. paper bound, 15c.; cloth bound, 2oc. 



GEO. L. ENGLISH & CO, Mineralogists, 

 Removed to 733 & 735 Broadway, New York. 



Course of Mineralogy for Yomig People. 



Third Grade ready, containing directions how to 

 study minerals bj* means of blowpipe analysis. 



Book, Collection, Correspondence one dollar 

 postage, 95 cents. Address 



GUSTAVE GUTTENBERG, 

 Central High School, Pittsburgh, Pa. 



