CONTENTS XXI 



WINKLER (c.) presents a paper of Dr. fr. P. Frets: „Complicated Mendelian 

 segregation in the heredity of headform in man". 435. 865. 



— presents a paper of F. Roels : "Inlercoraparison of some results obtained in the 

 investigation of memory by the natural and the experimental learning method". 477. 



winter temperatures (Periodicity of) in Western Europe, since A. D. 7G0. 1092. 

 w Y N G A A R D E N (c. T) E L I N D VAN) and W. Storm VAN Leeuwkn. On the elfect 



of Lobelin on the rise of blood pressure by Nicotin. 630. 

 WYTHOFF (w. A.). A relation between the polytopes of the Cfeoo-f»mily. 966. 

 YEAST-CELLs (On the nature and the signiiicance of volutin in). 70. 

 ZANDEN (j. M. VAN D E r) and P. VAN RoMBURGH. On Polymers of Methylchavicol. 64. 

 lEEUUisEN (h.) and H. Zwaardemaker. On the electric Nebulae of Antipyretica. 



1572. 

 zeeman (p.) presents a paper of Dr. J. P. Treüb: "On the saponification of fats". 



I. 35. II. 343. 



— Some experiments on gravitation. The ratio of mass to weight for Crystals and 

 Radioactive Substances. 542. 



Zoology. C. J. van dee Horst : "The fore-brain of Synbranchidae". 217. 



— J. F. VAN Bemmelen: "The wing-markings of Arctiidae". 849. 

 zwaardemaker (h.). On the behaviour of the uranium heart towards electric 



stimulation, as investigated by Mr. M. den Boer. 189. 



— presents a paper of A. de Kleyn and W. Storm van Leeuwen: "Concerning 

 vestibular eye-reflexes. I. On the origin of Caloric Nystagmus". 622. 



— presents a paper of W. Storm van Leeuwen and C. de Lind van Wijngaarden: 

 "On the efl'ect of Lobelin on the rise of Blood pressure by Nicotin". 630. 



— A contribution regarding the shifting of radio-active equilibria under the 

 influence of fluorescein". 768. 



— presents a paper of Prof. EcG. Dubois: "On the relation between the quantities 

 of the brain, the Neurone and its parts, and the size of the body". 1328. 



zwaardemaker (h.) and H. Zeehuisen. On the electric nebulae of Antipy- 

 retica. 1272. 



