XXVI CONTENTS. 



WENT (r. A. F. c.) presents a paper of Mr. W. H. Auisz: "Positive and negative 

 pliototropy of the apex and base in oat-seedlings (Avena sativa)". 363. 

 presents a paper of Mr. W. H. Artsz : "Adjustment to light in oats". 615. 



— presents a paper of Dr. A. H. Bliauw : "The primary photo-growthreaction 

 and the cause of the positive phototropism in Phycomyces nitens". 774. 



— presents a paper of Mr. J. A. Honing: "Hybridisation with Canna indica". 835. 



W E R T H E I M S A L o M o N S o N (l. K. A.). V. SaLOMONSON (I. K. A. WeRTHEIM). 



w 1 c II M A n N (a.). On the pseudometeorite of Igast in Livonia. 292. 



presents a paper of Dr. L. Rutten : "Elepbas antiquus Ealc. from the river 



Waal near Nijmegen". 769. 

 WINKLER (c.) presents a paper of Dr. C. T. van Valkenburg and L. U. J. Mestrom: 



"On the visual centra in the brain of an anophthalraos." 180. 

 >v I s s E L I N G II (c. van). On the nucleolus and karyokinesis in Zygnema. 11. 

 WOLFF (l. k.). On the formation of antibodies after injection of sensitized antigens, Ü4U. 

 w o L T J E R (h. u.) and P. Zeeman. Magnetic resolution of spectrum lines and 



temperature. 158. 

 WIJHE (j. w. van). On the metamorphosis of Amphioxis hmceoUitus. 574-. 

 ZEEMAN (p.). The red lithium line and the spectroscopic determiiuition of atomic 



weights. 155. 

 ZEEMAN (p.) and H. E. Woltjer. Magnetic resolution of spectrum lines and 



temperature. 158. 

 ZKRO ENTROi'V (On the question whether at the absolute) changes on mixing. 66'J. 

 ZERO-POINT ENERGY (Ou the luagnetizatiou of ferro-magnetic substances considered 



in connection with the assumption of a). 454. II. 468. 

 ZERO-POINT ENERGY (The deviations from Curie's law in connection with the). 432. 

 ZINC (The allotropy of). I. 565. 

 ZWAARUE MAKER (h ). On reinforcement of sound and sound-selection by means 



of microtelephone-apparatus. 194. 



— presents a paper of Mr. L. Arisz : "Variations of state in gelatin-solutions". 418. 



— Ou hearing apparatus examined after Lord Rayleigh's mode of arrangement. 492. 



— presents a paper of Prof. J. VV. Langelaan : "Experiments on the atonical 

 muscle". 336. IL 571. 



— presents a paper of Prof. EuG Dubois : "On the relation between the quantity 

 of brain and the size of the body in vertebrates". 647. 



— presents a paper of Dr. C. E, Benjamins: "On esophageal auscultation and 

 the recording of esophageal heart sounds". 1041. 



— presents a paper of Mr. L. Arisz : "Ou the Tyndall phenomenon in gelatin- 

 solutions". 331. 



zygnema (On the nucleolus and karyokinesis in). 11. 



