CON T E N T S. Alll 



X-RAYS (Oil tbe influence of the dimensions of the source of light in diffniction pheno- 

 mena of Fresnel and on the difl'raction of). 65. 



— (On the difl'raction of). 321. 420. 



ZEEMAN (p.). On an asymmetry in the change of the spectral lines of iron, radia- 

 ting in a magnetic field. 37. 9S. 



— Efl'ect (On the vibrations of electrified systems, placed in a magnetic field. A 

 contribution to the theory of the). 263. 340. 



Zoology. M. C. DEKUüiZES : //Cup-shaped red bloodcorpuscles (Chromocraters)." 154. % 



— A. A. W. HuBBECHT : "Haematopoiesis in the placenta of Tarsius and other 

 mammals." 167. 



