XX CONTEBRES 
LoRENTz (H. A.) presents a paper of Dr. B. VAN DER Pot Jr.: “Disconti- 
nuities in the magnetisation.” 637. II. 980. 
— presents a paper of Dr. H.C. Burcer: “Observations of the temperature 
during solidification.” 691. 
— presents a paper of Dr. A. D. Fokker: “The geodesic precession: a 
consequence of EINSTEIN’s theory of gravitation.” 729. 
— presents a paper of Dr. J. J. van LAAR: “On the equation of state 
for arbitrary temperatures and volumes. Analogy with PLANCK's for- 
mula.” II. 887. 
— presents a paper of Dr. H. A. Kramers: “On the application of 
EInsTEIN’s theory of gravitation to a stationary field of gravitation.” 1052. 
— presents a paper of Prof. J. A. ScHouTEN: “On geodesic precession.” 
1108. 
LUMINESCENCE (On centres of) and variations of the gas pressure in spectrum 
tubes at electrical discharges. 379. 
MAGMA (Crystallization and resorption in the) of the volcano Ruang. (Sangi 
Islands). 561. 
MAGNEsIUM (The electromotive behaviour of). [. 975. 
MAGNETISATION (Discontinuities in the). 637. II. 980. 
MaGNus (R.) and U. G. Butsma. On the pharmacological action of 
isoamylhydrocuprein (eukupin) and isoctyl hydrocuprein (vuzin). 481. 
— presents a paper of Prof. W. STORM VAN LEEUWEN and J. ZEYDNER: 
On adsorption of poisons by constituents of the animal body. Il. The 
adsorbent power of rabbit's serum for atropin.” 486. 
— presents a paper of Dr. A. DE KLEYN: “On the effect of tonic labyrinthine 
and cervical reflexes upon the eye-muscles.” 509. 
— presents a paper of Prof. W. STORM VAN LEEUWEN and Miss C. vaN 
DEN BROEKE: “A quantitative inquiry into the antogonism pilocarpin- 
atropin on the surviving cat-gut.” 628. 
— and A. pe KreyN. The function of the otolithes. 907. 
— presents a paper of Prof. W. STORM VAN LEEUWEN and F. VERzaR: 
“Concerning the sensitivity to poisons in animals suffering from avita- 
minosis.” 1170. 
— presents a paper of Dr. A. pe KreEyN: “Experiments on the quick 
component phase of vestibular nystagmus in the rabbit.” 1357. 
MAMMALS (On the homology of the M. marsupialis and the M. pyramidalis 
in). 1119; 
MANGANESE NODULES (On) in mesozoic deepsea deposits of Dutch Timor. 997. 
Mathematics. C. B. BiEzENO: “Graphical determination of the moments 
of transition of an elastically supported, statically indeterminate 
beam”. II. 60. 
