SCIENCE 



A WEEKLY RECORD OF SCIENTIFIC PROGRESS 



ILLUSTRATED. 



Entered in the Office of the Librarian of Congress, at Washington, D. C. 



No. 33-Vol. II. February 12, 1881. Price 1 O Cents. 



LABOR-S AVERS LENGTHEN LIFE. 



OUR aim is to furnish improved tools and appliances for those who work at the desk or in th» study. Many of our articles are unique, and are 

 the result of the focalized experience and skill of a large body of literary workers. Thus selecting the best, we reduce the cost to the 

 minimum by manufacturing in large quantities. Our customers may thus be sure of getting the best devices at the lowest prices. 



All interested are cordially invited to visit our stores, without feeling under obligations to purchase. It will repay you to see the many new and 

 useful improvements we are introducing. They are intended for wide-awake minds who are seeking the best and surest ways of record, arrangement, 

 and communication, and for those who enjoy comfortable reading and writing in comfortable surroundings. 



An Illustrated Catalog and Price List of 400 articles is free to applicants, and includes evf-y requisite needed for fitting 

 up a desk, study or library. 



THE PERFECTED STYLOGRAFIC PEN, 



A. T. Cross' Patent. 



A PENCIL THAT WRITES INK, NEVER NEEDS SHARPENING, AND NEVER WEARS OUT. 



Recent patented improvements have obviated all previous defects, and placed it far ahead of similar pens. Beware of imitations, and get the best 

 and only Perfect Pen. Warranted to suit or no sale. 



Our latest pattern, the I*I1*TI.,15 GIANT, is the most perfect outfit for writing ever made. It is Pen, Holder, and Inkstand, all in one ; but 

 three inches long, and holds ink enough for fifty pages of foolscap. May be carried in pocket, or on watch chain or eyeglass cord. Made in gre;»l 

 variety of style and finish. 



PRICE, $2.50 to $5.00. 



We instance a few of our many Speci, ties for Literary and Desk Work: 



THE ECONOMY Index, Study Table, Reading Desk, Eyi jhade, Student Lamp, Book Support, Inkstand, Sloping and Revolving Bookcases, 

 etc. .are each selected by experts as the best to be had for the money. 



SLOPING BOOKCASE. — Entire'y new — Six 1 g shelves, periodical rack, heavy castors, fine finish, holds more for the money than common 

 cases, as movable as an easy chair. $ 1 5, ash ; $ 1 7.50, walnut. 



STUDENT'S FOLDING TABLE. — Handsome, strong enough to hold safely 300 volumes, larger than a writing desk, folds instantly, occupies 

 only the space of a table leaf, can be carried easily anywhere by a child. Price $3. Inlaid chess board, or black walnut, $4-. 



SAVE YOUR EYES AND YOUR BACK.— Clark's Portable Book Rest will do more than anything else to correct the tendency to near-sight, 

 edness and round shoulders. The highest certificates from eminent physicians and oculists. Fh e styles, 15 to 10 cents each. Postage, 2 cents to 13 

 cents each. 



UTILITY SCRAP BOOKS.— No paste, pins, or springs, self-indexed. Of the 35 people who looked at it first, 25 bought copies. Price, 

 $ 1 .50. 



THE BEST ARTIFICIAL LIGHT KNOWN is the Genuine German Student Lamp, made by the original inventor, Kleemann, with improve- 

 ments suggested by eminent American oculists. Extra large size, $4.50, brass ; $5.50, nickel. 12 wicks, packed free for express j sold as cheap 

 as inferior imitations. 



SAVE YOUR EYES. — The Economy Patent Eye Shade, ventilated, reversible, self-adjusting, fits any head; no rubbers; no strings; three 

 widths ; the only perfect device to protect the eyes. Warranted to suit. 20 cents each. 



PERFECT PEN-GAGE IN KSTANDS.— The only perfect scientific Inkstand yet made. Sold on trial, warranted the best and to save their 

 cost in i:ik. $ 1 .30 to $2.50 each. 



H AMBLER POCKET FOR PEN AND PENCIL. — A simple.cheap device that carries pencil or Stylografic pen more conveniently than a coat or 

 vest pccket, and from which thfjf cannot be lost. Men who have lest several dollars worth of pencils and pens when stooping have tried this, and say 

 they would not be withow : * for ten times its cost. Price, 20c. for 2 pencils, to 4-Oc. for 4 pencils. Russia leather, with safety attachmen fur 

 coat, vest or dress. 



READERS AND WRITERS ECONOMY COMPANY, 



2 5-33 Fkanklin Street, Boston. 4 Bond Street, New York. 69 State Street, Chicago. 



