CONTENTS. 
ADIABATIO CHANGES (On) of a system in connection with the quantum theory. 576. 
AFRICA (Contributions towards the determination of geographical positions on the 
West coast of). IV. 465. 
AIR (Critical point, critical phenomena and a few condensation-constants of). 1088. 
ALGEBRAIC SURFACE (On the nodal-curve of an). 1115. 
ALKYLTOLUIDINES (On nitroderivatives of) and the relation between their molecular 
refractions and those of similar compounds. 564. 
ALLOTROPIC FORMS (RÖNTGEN-investigation of). 920. 
ALLOTROPY (The application of the theory of) to electromotive equilibria. V. 133. 
— (On the) of the Ammonium Halides. [IL 798. 
AMEYDEN (U. P. VAN). The influence sof light- and gravitational stimuli on the 
seedlings of Avena sativa, when free oxygen is wholly or partially removed. 1165. 
AMMONIA (The equation of state of water and of). 932. 
AMMONIUM-HALIDES (On the allotropy of the). [IL. 798. 
AMPERE’S molecular currents (An experiment of MaxweE.u and). 248. 
AMYGDALIN as nutriment for Aspergillus niger. 922. IL. 987. 
Anatomy. Mrs. C. E. DROOGLEEVER FORTUYN-VAN LEYDEN: “Some observations on 
periodic nuclear division in the cat”, 38. | 
— H. M. pr Burter and J. J. J. Koster: “On the determination of the position 
of the macula-planes and the planes of the semicircular canals in the cranium”, 49, 
— Dr. D. J. Hutsuorr Por: “The relation of the plis de passage of GRATIOLET to the 
ape fissure”. 104. 
— Pr. D. J. Hutsnorr Pot: ‘‘Uhe ape fissure — Sulcus lunatus — in man”. 219. 
— Dr. H. C. Detsman: “On the relation of the first three cleavage planes to the 
principal axes in the embryo of Rana fusca Rösel”. 498. 
— Dr. D. J. Hursnorr Pou: “The development of the Fossa Sylvii in embryos of 
Semnopithecus”. 938. 
ANUS (On the relation of the) to the blastopore and on the origin of the tail in 
vertebrates. 1256. 
APE FISSURE (The relation of the plis de passage of GRraTIoLET to the). 104. 
= (The) — sulcus lunatus — in man. 219. 
ARITHMETICAL FUNCTION (On an) connected with the decomposition of the positive 
integers into prime factors. I. 826. LI. 842. 
ASPERGILLUS NIGER (Metabolism of), 215. 
— (Amygdalin as nutriment for). 922. IL, 987. 
88 
Proceedings Royal Acad. Amsterdam. Vol. XIX. 
