PART I. AUTHOR-INDEX. I3I 



Poincarc, H. La theorie de Lorentz et les experiences de Zeemann. 



Eclairage electr. 11 (1897) 481-489; n88) 99) 5-15. 

 . Ueber die Stabilitat des Sonnenspectrums. Naturwiss. 



Rundsch. 13 (1898) 413-417. 

 . Le phenomene de Hall et la theorie de Lorentz. C.-R. 128 



(1899) 339-341- 

 Politzinc, A . Stir les hydrates du chlorure de cobalt et sur les change- 



ments de couleur de ce compose. Bull. Soc. chim. (1891) 264- 



266. 

 Poor, Ch. L., and 5. .4. Mitchell. The concave grating for stellar 



photography. Astrophys. J. 7 (1898) 157-163; Johns Hopkins 



Cir. 17 (1898) 61-62. 

 . The direct grating spectroscope. Astrophys. J. 8 (1898) 



235-236. 

 Pope, W. J. Ein bemerkenswerter Fall von Phosphorescenz. Ztsch. 



f. Krj'st. u. Min. 25 (1896) 567-571 ; Beibl. (1896) 373. 

 . The refraction-constants of crystalline salts. J. Chem. 



Soc. 69 (1896) 1530-1536; Ztsch. f. Kryst. u. Min. 28 (1897) 



113-128. 

 . Angular measurement of optic axial emergences. Proc. 



Roy. Soc. 60 (1896) 7-10. 

 Porter, T. C. Solution of alum. Nature 45 (1891) 29; Beibl. (1892) 



279-. 

 . The first visible colour of glowing iron. Nature 45 



(1892) 558-559. 

 . Contributions to the studv of "Flicker." Proc. Rov. 



Soc. 63 (1898) 347-356. 

 Potter, A . Le principe du retour des rayons et la reflection cristalline. 



J. de phys. (2) 10 (1891) 349-357- 

 Poynting, J. H. A graphic method for the explanation of the refrac- 

 tion fringes on the border of a shadow. Proc. Birmingham Phil. 



Soc. 7 (1890) 210-219; Beibl. (1891) 562. 

 Precht, J. Das Phosphoresciren der Gelatineplatten und die Lumi- 



nescenz der Pyrogallensaure. Photogr. Rundsch. 9 (1895) 320- 



324; Beibl. (1896) 203. 

 . Neuere Untersuchungen liber die Giiltigkeit des Bunsen 



Roscoe 'schen Gesetzes. Astrophotometrische Untersuchungen. 



Archiv. f. wissensch. Photogr. i (1899) 1 49-151. 

 Preston, Th. The Theory of Light. London; Macmillan 1890, 465 pp. 

 . Photography of the Zeeman Effect. Nature 57 (1897) 173; 



Beibl. (1898) 355. 



