iv 



SCIENCE.— ADVERTISEMENTS. 



NOTABLE IMPROVEMENTS 



in 



PROJECTION APPARATUS 



The New Reflectlns Lantern attachable to any Projec- 

 tion Lantern or Stereopticon, for showing upon the screen 

 prints, photos, engravings, sketches, diagrams, tiowers, 

 Entoinologicai and Anatomical Specimens, etc., all in 

 natural colors. Cuts in books may be shown without in- 

 jury to the book. 



The ProJeotlneMleroHcopeattachabletoany Pro- 

 jeelion Lantern or Stereopticon. Projection eye piece. Me- 

 diascopefor sliowinglarpeinicrospecimensandcoolingcell. 



The New Projection Spectroscopes and HolarlaeopeB 

 attacliable to any Proiection Lantern. 



Lnntern Slide!) to illustrate Educational and Scientific 

 Sulijects. We rent slides at low rates. Send for lists, 

 naming particular subject of interest. 



WILLIAMS, BROWN & EARLE, 

 Manufacturers vf Sterenptirana, Microscopes, etc. 

 nepurtnient SI, 918 Chestnut St., Philadelphia 



MARINE BIOLOGICAL LABORATORY 



Sapply Department — 1. Zoology — Preserved Material 



of all types of animals for class work or for the museum. 

 2. Botany — Preserved Material of Algae, Fungi, Liver- 

 worts and Mosses. For price lists and all information ad- 

 dress GEO. M. GRAY, Curator Woods HoU, Mass. 



Dr. HOWARD ADY, M.A., Pli.D., F.R.P.S.E., M.M.S., 



Etc., iiresents his compliments to Scientific men in U.S.A., 

 and says that lie will supply specimens of British rocks and 

 rock-sections for microscope, with or without full petro- 

 praphical notes at eighteen pence each (English money) post 

 free. Exchanges of Brilisli for American Minerals and Rocks En- 

 couraged. Lessons by Correspondence in Litliology a Specialty. 



11 Aspenlea Road, Hammersmith, London, W., England. 



WM. GAERTNER & CO. 



Astronomical and 

 Physical Apparatus 

 5347 and 5349 LAKE AVE., :: :: CHICAGO 



SPECIALTIES 

 Standard Apparatus of New and improved Designs 

 Reading Microscopes and Telescopes 

 Astronomical Telescopes Dividing Engines 



Spectroscopes Comparators 

 Mictielson interterometers General Laboratory Apparatus 



Bolometers Hellostats Univprsiii Laboratory Supports 



The Johns Hopkins University 



BALTIMORE, MARYLAND 



THIRTIETH YEAR 



Beginning October 5, 1905 



Ira Kemsen. President. 

 Edward H. Griffin. Dean of the College Faculty. 

 William H. Howell, Dean of the Medical Faculty. 



Instruction 



Foil Graduate Students : 



(a) In Philosophy and the Arts. (Courses for candi- 

 dates for the degree of Ph.D.) 



(b) In Medicine. (Courses for candidates for the 

 degree of M.D.; courses for physicians.) 



For Undergraduates : 



(c) As candidates for the degree of B.A. 



(d) As special students. 



Libra' ies 



University. 

 Peabody Institute, 

 Pratt Library, 



Laboratories 



Chemistry. 

 Physics. 



Geology and Mineralogy. 



Zoology. 



Anatomy. 



Physiology. 



Pathology and Bacteriology. 

 Pharmacology. 

 Physiological Chemistry. 

 E.Kperimental Psychology. 



Seminaries 



Greek. 



Latin. 



Sanskrit. 



Semitic. 



German. 



Romance. 



English. 



History. 



I'dlilical Economy. 

 Political Science." 

 Philosophy. 

 Mathematics. 

 Physics. 



123.000 volumes. 

 1.5.5,000 volumes. 

 2.50.000 volumes. 



Directors 



Ira Kemsen. 

 Joseph S. Ames. 

 M-ilUam B. Clark. 

 William K. Brooks. 

 Franklin P. Mall. 

 William H. Howell. 

 William H. Welch. 

 John J. Abel. 

 John J. Abel. 

 George M. Straiton. 



Directors 



Basil L. Gildersleere. 

 Kirby F. .Smith. 

 Maurice Bloom field. 

 Paul Haupt. 

 Henry Wood. 

 A. MarshaU Elliott. 

 James 11'. Bright. 

 John M. \'incent. 

 J. H. Hollamlir. 

 W. W. Willoughby. 

 J. Mark Baldwin. 

 J') ank Morley. 

 Joseph S. Ames. 



NEW LABORATORY AND STUDENT'S BALANCE 

 Large Capacity Higti Accuracy 



Greatest Convenience Low Cost 



Undergraduate Courses (leading to B.A.) 



Groups 



1. Classical 



( the ■ • old college course " ) . 



2. Matliematical-Physical 



(leading up to engineering). 



3. Chemical-Biological 



(leading up to medicine). 



4. Geological-Biological. 

 .5. Latin-Matliematical. 

 G. Historical-Political 



(leading up to law). 

 7. Modern Languages. 



Serial Publications 



American Journal of Mathematics (vol. XXVII). 



American Chemical .Journal (vol. XXXIV) 



American .lournal of Pliilology (vol XXVI). 



Studies in Historical and Political Science (vol. XXIII ). 



Modern Language Notes (vol. XX). 



Memoirs from the Biological Laboratory (vol. VI). 



Contributions to Assyriology (vol. V). 



Terrestrial Magnetism (vol. X.) 



University Circular (vol. XXIV.) 



Programmes of the courses offered to graduate students in 

 Philosophy and the Arts and in the department of Medicine, 

 and also of the undergraduate or collegiate courses, will be 

 sent on application to the Registrar. 



