SCIENCE-ADVERTISEMENTS 



SCIENCE AND EDUCATION 



A series of volumes for the promotion of scientific researcit and educational progress 



Edited by J. IVlcKEEN CATTELL 



Volume I. The Foundations of Science. Including Science and Hypothesis; The Value 



of Science ; Science and Method, by H. POINCARE 



Anthorized English translation by Professor George Bruce Halsted with a preface by the author and an in- 

 troduction by Professor Josiah Eoyce. Published December, 1913. Pages xii+553. Price, $S.60 net. 



Volume II. riedical Research and Education 



By Richard M. Peakce, The University of Pennsylvania; William H. Welch, W. H. Howell, Franklin 

 P. Mall, Lewellts F. Barker, The Johns Hopkins University; Charles S. Minot, W. B. Cannon, 

 W. T. Councilman, Theobald Smith, Harvard University ; G. N. Stewart, Western Reserve Uni- 

 versity ; C. M. Jackson, E. P. Lyon, University of Minnesota; James B. Herhick, Rush Medical 

 College ; John M. Dodson, University of Chicago ; C. R. Bardeen, University of Wisconsin ; W. 

 Ophuls, Stanford University ; S. J. Meltzer, Rockefeller Institute for Medical Research ; James 

 EwiNO, Cornell University Medical College; W. W. Keen, Jefferson Medical College; Henry H. 

 Donaldson, Wistar Institute of Anatomy ; The late Charles A. Hbrter, Columbia University ; The 

 late Henry P. Bowditch, Harvard University. 



Published October, 1913. Pages m+6S6. Price, S3. 00 net. 



Volume III. University Control 



By J. McKeen Cattell. Together with a series of Two Hundred and Ninety-nine Unsigned Letters 



by Leading Men of Science holding Academic Positions and Articles by Joseph Jastrow, George T. 



Ladd. John J. Stevenson, J. E. Creighton, J. McKeen Cattell, George M. Stratton, Stewart 



Paton, John Jay Chapman, James P. Munroe and Jacob Gould Schurman. 



Published March, 1913. Pages x +484. Price, S3. 00 net. 



THE SCIENCE PRESS 



GARRISON, N. Y. LANCASTER, PA. 



SUB-STATION 84, NEW YORK CITY 



NEW LEITZ SMALL TRAVELING MICROSCOPE 



THE IDEAL INSTRUMENT 



u. s. 



BRANCH 



FOR THE FIELD BIOLOGIST 



Folded up in morocco case with nickel-plated 

 corners it measures : 



Length : lOj^ inches, width : 654 



nches, height: 3u inches 



Entire weight: four pounds 



While folding microscopes of various models 



and dimensions are in existence for many 



years, the demand has been felt for "a real 



Small Travi-liiiK Microscope" of precision in 



workmanship and high standard. 



After considerable experimenting we have 

 succeeded in constructing such an instrument, 

 and therefore present herewith 

 A Small Traveling Microscope of 

 "LEITZ STANDARD" 

 small enough to be carried along by the scien- 

 tist in his suitcase. 

 A special feature : 



The stand is supplied with new right hand 

 side fine adjustment of ball bearing type. 



Its efficiency is supreme and durability 

 unquestionable. 



Write for literature 67-0 



INEW VORK 

 30 East 18th Street 



