CONTENTS, 
ACID (Synthesis of trioxybutyric). 77. 
— On g-hydroxybutenoic) and its decompositions. 79 
— (On the action of nitric acid on alkylated amides of p. toluenesulphonic). 616. 
AFRICA (Contributions to the determination of geographical positions on the West- 
Coast of). 274. 
AIRY’s method (On J..C. Kaprryn’s criticism of) to determine the apex of the solar 
motion. 221. Reply to it. 232. 
AKEN (B. VAN). The oxidation of organic nitrogen-compounds and the estimation 
of the carbon and nitrogen therein by the moist process, 91. 
ALLOYS (A method for separating crystals from). 758. 
AMALGAMS (Cadmium). 1. 
AMIDES (On the action of nitric acid on alkylated) of p-toluenesulphonic acid. 616. 
\ AMPHTOXUS LANCEOLATUS (On the infundibular region of the brain of). 695. 
APEX of the solar motion (On J. C. Kaprnyn’s criticism of Arry’s method to deter- 
mine the). 221. Reply to it. 232. 
APPARATUS for focussing (An) the projecting-microscope from a distance. 95. 
“ AROMATIC COMPOUNDS (On the influence of the position of atomgroups in) on the 
process of the reactions. 161. 
—- SERIES (Bromination and nitration in the). 643, 
— SULPHIDES (On the influence of different atoms and atomic groups on the cons 
version of) into sulphones. 264. 
ASYMMETRY (On the) of the electro-capillary curve. 560. 
Astronomy. E. F. van pe SANDE BAKHUYZEN: 7On the results of the observations of 
the Dutch eclipse-party”. 85. 
— J. Svein: „On J. C. Kapreyn’s criticism of Airy’s method to determine the 
apex of the solar motion.” 221. 
— J. C. Kaprnyn: „Reply to the criticism of Dr. J. Svein”. 232. 
— C. SANDERS: „Contributions to the determination of geographical positions on the 
West-coast of Africa.” 274. 
— H. G. van DR SANDR BAKHUYZEN: „The relation between the brightness of a 
luminous point and the moments at which we observe its sudden appearance or 
disappearance.” 465. 
— Preliminary Report of the Dutch Expedition to Karang Sago (Sumatra). 593. 
ATOMGROUPS (On the influence of the position of) in aromatic compounds on the 
process of the reactions. 161. 
atoms (On the influence of different) and atomic groups on the conversion of aromatic 
sulphides into sulphones. 264. 
4 
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Proceedings Royal Acad, Amsterdam, Vol, IV, 
