GON TSE N “FSS XXXI 
SERRA DO GERICINO (On the alkalirocks of the) to the northwest of Rio de 
Janeiro and the resemblance between the eruptive-rocks of Brazil and 
those of South Africa. 1241. 
SERUM-LIPOCHROME (On). Part II. 766. 
SILVER (Extinction by a blackened photographic plate as function of 
wavelength, quantity of) and size of the grains. 848. 
SITTER (W. pe). On the possibility of statistical equilibrium of the 
universe. 866. 
SLUITER (C. PH.) presents a paper of Prof. J. E. W. InrE and Dr. G. 
J. vAN Oorptr: “On the larval development of oxyuris equi (Schrank).” 603. 
SMITS (A). On the validity of the law of partition for the equilibrium 
between a mixed-crystal phase and a coexisting liquid. I. 679. 
— and J. SPUYMAN. The thermo-electric determination of transition 
points. I. 687. 
— and G. J. De Gruyter. The electromotive behaviour of aluminium. 
II. 966. 
— L. v. p. LANDE and P. Bouman. The existence of hydrates in aqueous 
solutions. 969. 
— and R. Pu. Beck. The electromotive behaviour of magnesium. I. 975. 
— and J. SPUYMAN. A thermo-electrical differential method for the 
determination of transition points of metals at comparatively low 
temperatures. 977. 
SNETHLAGE (Miss A.), G. C. Dippetz, P. ZEEMAN and W. DE GROOT. 
The propagation of light in moving, transparent, solid substances. III. 
Measurements on the Fizeau-effect in flint glass. 1402. 
Sopium (The aluminates of). Equilibriums in the system Na; O—Al, O;,—H,0O. 
129. 
SODIUM-CHLORATE and sodium-bromate (Investigation by means of x-rays 
of the crystalstructure of). 644. 
SOLAR SPECTRUM (The general relativity theory and the). 522. 
SOLIDIFICATION (The process of), as a problem of conduction of heat. 616. 
— (Observations of the temperature during). 691. 
Souips (On the adsorption of odorous molecules to the surface of). 654. 
— (Note on the paramagnetism of). 989. 
SPACE TIME SYMMETRY. I. General considerations. 1419. II. Discussion of a 
special case. The tetrahedrical atom-models of Landé. 1428. III. Remarks 
on the deduction of groups of space-time symmetry-operations. 1434. 
SPECTRUM-LINES (Measurements on the intensity of) by the aid of the 
echelon. 790. 
SPECTRUM TUBES (On centres of luminescence and variations of the gas 
pressure in) at electrical discharges. 379. 
