J. GRUNOW 



6S1 Sixth Avenue, New York. 



Established 



TVIicroscope Stands, 

 Oil Immersion Object- 

 ives and Abbe Con- 

 densers for Bacterial 

 and Histological work, 

 of Objectives, Camera 

 Lucida and other ac- 

 cessory apparatus. 



JVan^s. 



j^N EDUCATED AND CAPABLE PERSON 

 wanted in every town and city to canvass for sub- 

 scriptions to Science: liberal compensation. Address, 

 naming references, Publisher of Science, 47 Lafayette 

 -Place, New York city. 



A TEMPORARY BINDER 



*for Science is now ready, and will be mailed 

 .postpaid on receipt of price. 



Cloth 



Half Morocco - 



75 ' 



This binder Is strong, durable and 

 elegant, has gilt side-title, and allows 

 the opening of the pages perfectly 

 flat. Any number can be taken out 

 or replaced without disturbing the 

 others, and the papers are not muti- 

 lated for subsequent permanent bind- 

 ing. Filed in this binder. Scii;nce is 

 always convenient for reference. 



D. C. HODGES, 



Lafayette Place, New York. 



SCIENCE. 



MAP-MAKING. 



[Vol. XI. No. 267 



All publishers or others de- 

 siring to have maps made, 

 either from relief plates or by 

 lithograph, should write to us 

 for estimates before placing 

 their orders elsewhere. Any 

 work entrusted to us will be 

 carefully made under the super- 

 vision of our geographical edit- 

 or. Dr. Franz Boas. 



N. D. C. HODGES, 



Publisher of Science, 

 47 Lafayette Place, 



New York. 



QUSTAV E. STECHERT, 



828 Broadway, New York. 

 Importer of Scientific Books and Periodicals. 

 Branches : Leipzig, Hospital Str. 16 ; Lon- 

 don. 36 Kins William Str., Strand. 



HypimspiK 



ALMOSTAS PALATABLE 

 ^ AS MILK. 



So diRprnised that tho most 

 dehcato 8tomach can taku it. 



Remarkable as a. 

 FLESH PRODUCER. 

 Persona gain rapidly 



while taking It. 



vlr 1 ' 1 In Ph-\ .-ii-ians to bo tlic FINTST 

 and LLbT pr^i .nation of its class for tlie rc-UcI of 

 CON'iniPTION, SrnOFXIT.A, GEXET! IT. 



DrniTiTT. n iSTisG diseases or 



CIIILJiltEN,an,l CHROXIC COVfSnS. 



All Dr.nGGisis. Scott & Bowne, New Ycrk 



"How to Strengthen the Memory." 



Rev. E. L. Kelly, of Paterson, N. J., writing of Dr 

 Holbrook's book, " How to Strengthen the Memory ; 

 or, Natural and Scientific Methods of Never Forgetting,*' 

 says; "I have read this treatise, this gem, and find a 

 mine of wealth hidden in its pages. By it I was enabled 

 last evening to learn the poem °Stabat Mater.' in Latin. 

 It took a little time, but the results were marvelous." 

 Catalogue and prospectus free. 



Mailed to anv address on receipt of $1, by 

 M. L. HOLBROOK CO . 13 Laight St., New York. 



BOTANY FOR ALL GRADES. 



HOOKERS' SCIENCE PRIMER OF BOTANY. 



A very interesting and valuable little work designed to 



supply an elementary knowledge of the principal facts of 



plant-life. 



Introduction price, 35 cents. 



YOU MANS' FIRST BOOK OF BOTANY. 



Designed to cultivate the observing powers of children. 

 Plants themselves are the objects of study. The pupil is 

 told very little, and from the beginning throughout is sent 

 to the plant to get his knowledge of the plant. 

 Introduction price, 64 cents. 



YOUMAN'S DESCRIPTIVE BOTANY. 



A practical guide to the classification of plants with a 

 Popular Flora. In this work the pupil is introduced to the 

 study of Botany by direct observation of vegetable forms. 

 The book provides for the study of all those features that 

 are used in classification and illustrates by practical exam- 

 ples the uses to be made of these observations in Systematic 

 Botany. 



Introduction price, $1.20. 



BENTLEY'S PHYSIOLOGICAL BOTANY. 



Prepared as a sequel to Descriptive Botany by Eliza A. 

 Youmans. 



Designed to give an elementary account of Structural 

 and Physiological Botany, or of the inner and minute or- 

 ganisms and activities of plants. 



Introduction price, $1.20. 



HENSLOW'S BOTANICAL CHARTS. 



Modified and adapted for use in the United States by 

 Eliza A. Youmans. Six charts mounted on rollers contain- 

 ing nearly five hundred figures colored to the life, which 

 represent twenty-four orders and more than forty species 

 of plants. These charts are the only ones of the kind ever 

 published, and form an invaluable aid to the systematic 

 study of Botany. 



Price, per set with key, mounted on " Excelsior Map 



Supporter," $19.25. 



Without Supporter, $ 5.75. 



Specimen copies mailed, post-paid, to teachers — for examination — at the introduction prices. Send for full descriptive 

 circulars. 



D. APPLETON %L CO., PUBLISHERS, 



NEW YORK, BOSTON, CHICAGO, ATLANTA, SAN FRANCISCO. 



