II 



SCIENCE. 



SCIENCE: 



A WEEKLY JOURNAL OF SCIENTIFIC PROGRESS. 



ILLUSTRATED. 



To Correspondents. 



All communications should be addressed to the Editor — box 3838, P. O., New York — with name and address of 

 writer, not necessarily for publication without consent. 



Scientific papers and correspondence intended for publication should be written legibly on one side only of the 

 paper. Articles thus received will be returned when found unsuitable for the Journal. 



Those engaged in Scientific Research are invited to make this Journal the medium ot recording their work, and 

 facilities will be extended to those desirous of publishing original communications possessing merit. 



Proceedings of Scientific Societies will be recorded, bjt the abstracts furnished must be signed by the 

 Sectetaries. 



Both questions and answers in " Notes and Queries " should be made as brief as possible ; an answer appearing 

 tc demand an elaborate reply may be written in the form of an article. 



To Subscribers. 



Terms of subscriptions for SCIENCE will be $4 a year, payable in advance. Six months, $2.50. Single copies 

 10 cents. 



Subscriptions forwarded by mail should be addressed to the Editor, Box 3838, P. O., New York, and Post-office 

 Orders made payable to "John Michels." 



To Advertisers. 



Terms for advertising may be obtained at the office of the Journal. 229 Broadway, New York. 



CLUB RATES. 



Analyst 



Appleton's Monthly i 



Amf.kican Naturalist 



American Journal of Science 



American Journal of Microscopy. 



American Machinist _ 



American Monthly Microscopical Journal. 

 American Manufacturer and Iron World. . 



Boston Journal of Chemistry 



Chicago Medical Review ; 



Chicago Field 



Druggist . 



Druggists' Circular 



Fducational Monthly (Barnes ) 



Engineering News 



Engineering and Mining Journal ,. 



Education 



Engineering Magazine 



Harper's Magazine 



Harpers Weekly 



Harper's Bazar 



Harper's Young People 



Humboldt Library 



International Review 



Subscrip-j With 

 tion. Science. 



$2.00 



$5-So 



3.00 



6.26 



4.00 



7.20 



6.00 



8.50 



1.00 



4.70 



3.00 



6.70 



1.00 



4.80 



4.25 



7.00 



1.00 



4-75 



2.00 



5-5° 



4.00 



7.00 



1.60 



5-25 



i-5° 



5-2S 



1-5° 



5.20 



3. CO 



6.2S 



4.00 



7.00 



4.00 



7.00 



5.00 



8.25 



4.00 



7.00 



4.00 



7.20 



4.00 



7.20 



1.50 



5.20 



3.00 



6.25 



5.00 



8.00 



Iron 



Journal of the Telegraph 



London Lancet 



Magazine of American History 



Mining and Scientific Press 



Nature... . 



N. Y. Medical Journal 



New England Journal of Education. 



North American Review 



Operator 



Science Monthly 



Sanitary Engineer - 



Prac ical American _ 



Pac fic Rural Press 



Scribner's Monthly 



Science Observer 



Scientific American 



" " Supplement 



" with Supplement. 



Southern Medical Record 



Mudent 



St. Nicholas 



Young Scientist 



Subscrip 

 tion 



7.50 



Q-34 



2.00 



5-50 



5.00 



7.50 



2.00 



5-5° 



4 00 



6.40 



6.00 



9-iS 



4.00 



7.00 



3.00 



6.40 



5-oo 



7-7S 



1.00 



4.80 



5.00 



6.00 



3.00 



6.50 



I. S o 



S-oo 



4.00 



7.00 



4.00 



7.20 



•50 



4.40 



3.20 



6.56 



5.00 



8.00 



7.00 



9.60 



2.00 



5-4° 



1.00 



4-75 



3.00 



6.40 



•50 



4-3° 



BOOKS AT TRADE PRICE. 

 Among the facilities we offer to regular subscribers is the purchase of Books at trade prices, making a reduction 

 ranging from 20 to 40 per cent, on the publishing prices. Buyers of a few books may thus, during a year, save the 

 fall cost of subscription to " SCIENCE." Send name of Book, Author and Publisher and in reply a postal card will 

 be sent, stating amount to be remitted. 



