SCIENCE-ADVERTISEMENTS 



Weiss Electro-Magnets 



Made by 

 Societe Genevoise 



Weiss EHectro-magnets are made 

 in four sizes, and with five different 

 forms of pole-pieces. The winding 

 is close to the ends of the poles, 

 thereby concentrating the field at 

 that point. Water cooling, with 

 copper jackets, is provided, thus 

 doubling the p>eriod of continuous 

 use. A micrometer screw is furnish- 

 ed, by the use of which the pole 

 pieces may be adjusted to within 0.1 

 mm. The magnet is adapted for 

 polarization and other attachments. 



Write for Special Descriptive 

 Circular. 



JAMES G. BiDDLE 



1211-13 ARCH ST. special Repreientatlve PHILADELPHIA 



When in Piiiladelphta be sure to visit our Permanent Exhibit of Scientific Instruments 



SCIENCE AND EDUCATION 



A series ot volumes for the promotion of scientific research and educational progress 



Edited by J. McKEEN CATTELL 



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

 of Science ; Science and Method, by H. POINCARB 



Authorized English translation by Professor George Brnce Halsted with a preface by the author and an in- 

 trodnotion by Professor Josiah Koyoe. Published December, 191S. Pages xii+55S. Price, SS.50 net. 



Volume IL iledical Research and Education 



By RiCHABD 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. Herrick, Rush Medical 

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

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

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

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

 late Henry P. Bowditch, Harvard University. 



Published October, 1913. Pages vi+5S6. Price, 13.00 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 Jasthow, George T. 



Ladd, John J. Stevenson, J. E. Crbighton, J. McKeen Cattell, George M. Sthatton, Stbwabt 



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



Published March, 1913. Pages X+4S4. Price, $3.00 net. 



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