x CONTENTS 



PAGE 



26. On Geissler Thermometers 481 



American Journal of Science (3), XXI, 451-453, 1881. 



PART IV. LIGHT. 485 



29. Preliminary Notice of the Eesults Accomplished in the Manufacture 



and Theory of Gratings for Optical Purposes 487 



Johns Hopkins University Circulars No. 17, pp. 248, 249, 1882. 

 Philosophical Magazine (4), XIII, 469-474, 1882. 

 Nature, 26, 211-213, 1882. 



30. On Concave Gratings for Optical Purposes 492 



American Journal of Science (3), XXVI, 87-98, 1883. 

 Philosophical Magazine (5), XVI, 197-210, 1883. 



31. On Mr. Glazebrook's Paper on the Aberration of Concave Gratings. 505 



American Journal of Science (3), XXVI, 214, 1883. 

 Philosophical Magazine (5), XVI, 210, 1883. 



33. Screw 506 



Encyclopaedia Britannica, Ninth Edition, Vol. 21. 



39. On the Relative Wave-lengths of the Lines of the Solar Spectrum . . . 512 

 American Journal of Science (3), XXXIII, 182-190, 1887. 

 Philosophical Magazine (5), XXIII, 257-265, 1887. 



41. Table of Standard Wave-lengths 517 



Philosophical Magazine (5), XXVII, 479-484, 1889. 



42. A Few Notes on the Use of Gratings 519 



Johns Hopkins University Circulars No. 73, pp. 73, 74, 1889. 



46. Report of Progress in Spectrum Work 521 



The Chemical News, LXIII, 133, 1891. 



Johns Hopkins University Circulars No. 85, pp. 41, 42, 1891. 



American Journal of Science (3), XLI, 243, 244, 1891. 



49. Gratings in Theory and Practice 525 



Philosophical Magazine (5), XXXV, 397-419, 1893. 

 Astronomy and Astro-Physics, XII, 129-149, 1893. 



50. A New Table of Standard Wave-lengths 545 



Philosophical Magazine (5), XXXVI, 49-75, 1893. 

 Astronomy and Astro-Physics, XII,. 321-347, 1893. 



51. On a Table of Standard Wave-lengths of the Spectral Lines 548 



Memoirs of the American Academy of Arts and Sciences, XII, 101-186, 

 1896. 



52. The Separation of the Rare Earths 565 



Johns Hopkins University Circulars No. 112, pp. 73, 74, 1894. 



57. Notes of Observation on the Rontgen Rays. By H. A. Rowland, N. 



R. Carmichael and L. J. Briggs 571 



American Journal of Science (4), I, 247, 248, 1896. 

 Philosophical Magazine (5), XLI, 381-382, 1896. 



