CONTENTS xi 



PAGE 



58. Notes on Rontgen Bays. By H. A. Rowland, N. R. Carmichael and 



L. J. Briggs 573 



Electrical World, XXVII, 452, 1896. 



59. The Eontgen Ray and its Relation to Physics 576 



Transactions of the American Institute of Electrical Engineers, XIII, 

 403-410, 430, 431, 1896. 



64. Diffraction Gratings 587 



Encyclopaedia Britannica, New Volumes, III, 458, 459, 1902. 



ADDRESSES 591 



1. A Plea for Pure Science. Address as Vice-President of Section B of 



the American Association for the Advancement of Science, Minne- 

 apolis, August 15, 1883 593 



Proceedings of the American Association for the Advancement of Science, 

 XXXII, 105-126, 1883. 



Science, II, 242-250, 1883. 



Journal of the Franklin Institute, CXVI, 279-299, 1883. 



2. The Physical Laboratory in Modern Education. Address for Com- 



memoration Day of the Johns Hopkins University, February 22, 



1886 614 



Johns Hopkins University Circulars No. 50, pp. 103-105, 1886. 



3. Address as President of the Electrical Conference at Philadelphia, 



September 8, 1884 619 



Report of the Electrical Conference at Philadelphia in September, 1884, 

 Washington, 1886. 



4. The Electrical and Magnetic Discoveries of Faraday. Address at 



The Opening of the Electrical Club House of New York City, 1888 . 638 

 Electrical Review, Feb. 4, 1888. 



5. On Modern Views with Respect to Electric Currents. Address Be- 



fore the American Institute of Electrical Engineers, New York, 



May 22, 1889 653 



Transactions of the American Institute of Electrical Engineers, VI, 342- 

 357, 1889. 



6. The Highest Aim of the Physicist. Address as President of the 



American Physical Society, New York, October 28, 1899 668 



Science, X, 825-833, 1899. 



American Journal of Science (4), VIII, 401-411, 1899. 



Johns Hopkins University Circulars No. 143, pp. 17-20, 1900. 



BIBLIOGRAPHY 679 



DESCRIPTION OF THE DIVIDING ENGINES DESIGNED BY PRO- 

 FESSOR ROWLAND 689 



INDEX. 699 



