CONTENTS. 



ABNORMALITIES (A hypothesis concerning the mutual relation between some hereditary) 



that occur combined. 194. 

 ACETATES (Two crystallised, isomeric d-fructose-penta) 281). 

 ACID (The double) from normal- and allo-cinnaraic acids. 1230. 

 ADiABATic invariants of mechanical iystems. I. 14Ü II. 158 III. 163. 

 ALKYLANILINO GROUP (On the replacement, in amides, of an) by an aniline group, bv 



heating with aniline hydrochloride. 983. 

 ALLOTaoPY (On the) of Cadmium. VI. 1177. 

 .VMIDES (On the replacement, in) of an alkylanilinogroup by an aniline group, by 



heating with aniline hydrochloride. 983. 

 AMiNO-ACiDS (Constitution-formula of) and of betain. 88. 

 AMYGDALiN as nutriment for Fusarium. 185. 

 Anatomy. G. P. Frets : "Meudelian segregation with the heredity of headtorm in 



man." 435. 



— (J. VAN NooRT : "The auditory and visual cortex in the brains of two Ma<lu- 

 rese'. 779. 



— J. P. Vergouwen Jr.: "On the variability of the number of giant pyramidal 

 cells in the Heschl convolution in man". 788. 



— G. P. Frets : "Clom plicated Meudelian segregation in the heredity of head- 

 form in man". 865. 



— H. C. Delsman: "Short history of the head of vertebrates". 1005. 



— EuG. Dubois: "On the relation between the ijuuntities of the brain, the neurone 

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



andesites (Old) and Brecciated Miocene. 597. 



aniunehydroch];ORIDE (On the replacement, in amides, of an alkylnnilino-group by 



an aniline-group, by heating with). 983. 

 AXTiPYRETiCA (On the electric nebnlae of). 1272. 

 apertures (On the diH'raction phenomenon caused by a great number of irregularly 



distributed) or of opaque particles. 1278. 

 akctiidae (The wing-markings of). 849. 



ARGON-nitroiien mixtures (On the sparkiug-potential of ). 1025. 

 associating substance (The equation of state of an). 365. 

 Astronomy. VV. de Sitter: "On the curvature of s|)ace'\ 229, 



— A. Pannekoek: "The origin of the Saros". 943. 



— C. DK Jong: "Investigation concerning the precession-constant and the systematic 

 projier-niotions of the stars". 956. 



92 



Proceedings Royal Acad. Amsterdam. Vol. XX. 



