The Ganong Botanical 

 Apparatus 



Attention is called to the apparatus for use 

 in plant physiology, and especially adapted 

 for college and secondary school work, which 

 we are producing under the direction of Pro- 

 fessor W. F. Ganong, of Smith College. 



New methods of teaching botany make 

 this apparatus indispensable. 



Experiments in photosynthesis, transpira- 

 tion, osmosis, respiration, may be carried on 

 by the use of this apparatus, so as to render 

 processes intelligible to students. 



A complete descriptive catalog with full 

 directions for use of the various pieces has 

 been published and will be sent free on re- 

 quest. 



q "PRISM" IS A LITTLE MAGAZINE we 

 publish monthly. Not a mere advertisement, but a 

 beautifully made and printed publication about that 

 world of wonder and beauty seen by the lens. Send 

 us your name and we will enter your subscription FREE. 



Bausch & Lomb Optical Co., Rochester, N.Y. 

 New York, Boston, Washington.Chicago, San Francisco 



WATSON & SOWS' FRAIKI MICROSCOPE 



This model is a 

 favorite one with 

 British students 

 and it is especially 

 advantageous be- 

 cause additions 

 may be made to it 

 as may be found 

 necessary or con- 

 venient. 



It has Watson's 

 diagonal rack-work 

 coarse adjustment 

 and perfected lever 

 fi n e adjustment. 

 The stage is covered 

 with rubber and it 

 carries an Abbe il- 

 luminator. A late 

 president o f t h e 

 Eoyal Microscop- 

 ical Society said of 

 it : "A Microscope 

 that can for the 

 first time with truth 

 be called 'good 

 enough for Histo- 

 logical purposes.' " 



Price, stand only c 4 



With § and | Objectives, 1 ocular and case £6160 

 With " " 2 oculars, Abbe 



Illuminator with Iris diaphragm, and case £8 6 



Illustrated 178-page catalogue of microscopes and accessories 

 mailed free on request; more than 20 models to select from at $10. up 

 Microscopes may be imported free by Educational Institutions. 



WATSON & SONS, Microscope Manufacturers, 



WHOLESALE AND RETAIL 



313" HIGH H0LB0RN, LONDON. ENGLAND 



; Established 1837. Awarded 42 Gold and other medal6 — micro- 

 scopic Objects may be conveniently sent to the U. S. by parcel post. 



American Agents: The Scientific Shop (A.B. Portkb) Rooms 1230. 

 1245 Monon Building, 324 Dearborn Street, Chicago, through whom 

 orders should be sent. . 



Microscopes 



For School 



and 



College Use 



Can be imported free of 

 duty at a saving of 

 from 35 to 40% from the 

 American prices. We 

 import microscopes for 

 the largest institutions 

 in the country. 



The New 

 Reflecting Lantern 



for showing on the screen opaque objects, 

 book illustrations, engravings and lantern 

 slides, is the most perfect instrument of its 

 kind. It has a detachable Book-Holder. 

 Concentrates all light on the object. 

 Shows printed matter correctly. 



Lantern Slides and Microscopic Slides 



illustrating Botany, Geology and other sciences. 

 Lists on application. 



WILLIAMS, BROWN & EARLE, 

 Dept. 3 , 918 Chestnut St., Philadelphia, Pa. 



PETROGRAPHY & GEOLOGY 



I. Collection of Lantern Slides representing the micro- 

 photos of the plates of the latest edition of H. Rosen- 

 busch's and E. Wulflng's text-book, " Mikroskopische 

 Physiographie," Vol. I., Parts I. and II. 



Rosenbusch-Collection A (Plates IV.-XVL, Vol. I., 



Part I.), showing growth of crystals, inclusions, aggre- 

 gates, deformations, &c. ; 76 slides, 106 Marks. 



Rosenbusch-Collection B (Plates I.-XII., Vol. I., 

 Part II.), showing the rock-forming minerals, 72 slides 

 100 Marks. 



II. The New Collection of Slides for the illustration 

 of the Study of Earthquakes, arranged by Dr. A. 

 Sieberg (Strassburg) ; showing not only the effects of 

 earthquakes, but principally the mode of investigation ; 

 seismometer, seismoscope, seismogram, &c, &c. ; the col- 

 lection consists of 78 slides, 110 Marks. 



New Supplement of the Earthquake-Collection, the 

 Valparaiso and San Francisco Earthquakes ; 25 slides, 

 36 Marks. 



Ask for our New Semestral Lists of Minerals, Rocks, and 

 Fossils, each separate. Minerals sent for Inspection. 



Collections of Minerals, Fossils, Meteorites, purchased 

 for cash or exchanged. 



Dr. F. KRA1NT2; 



RHENISH MINERAL OFFICE, B0NN-0N-RHINE, 



Established 1833 GERMANY. Established 1833 



