X1V CON T ENTS, 
SCHOUTE (P. H.). On groups of polyhedra with diagonal planes derived from poly- 
topes. 277. 
— On fourdimensional nets and their sections by spaces. 3rd part. 380. 4th part. 
543. 
— presents a paper of Mr. Lucien Gopraux: “The types of bilinear «*-complexes 
of M;_2 in Spr.” 625. 
SCUREINEMAKERS (Ff. A. H.). Fquilibria in quaternary systems. 138. 
— The system: Copper sulphate, Copper chloride, Ammonium sulphate, Ammonium 
chloride and water at 30°, 615. 
SCIAPHILA NANA BL. (Some remarks on). 590, 
SECRETION OF NECTAR (On the biological significance of the) in the flower. 445. 
SECTIONS (On fourdimensional nets and their) by space. 3rd part. 380. 4th part. 548. 
SERUMANAPHYLAXIS (Contributions to the study of). Ist Communication. 621. 2nd 
Communication. 784. 3rd Communication. $59. 
SEXTICS (On certain twisted). 346. 
SHELLS (On the behaviour of fossil) in water containing carbonic acid. 236. 
SHOWERS at Batavia (On the duration of). 555. 
SILVER (SUB-) HALOIDS (A contribution to the photo-chemistry of). 730. 
SITTER (W. DE). On the periodic solutions of a special case of the problem of 
four bodies. 682. 
SLEESWIJK (J. G.). (Contributions to the study of serumanaphylaxis. Ist Commu- 
nication. 621. 2nd Communication. 784. 3rd Communication. 859. 
sMITS (a.). The P-7-X-spacial figure for a system of two components which are 
miscible in the solid or liquid crystalline state in all proportions. 165. 
SMI TS (A.) and J. P: Wisaur. The dynamic conception of a reversible chemical 
reaction. 162. 
SODIUM DISULPHIDE (Reduction of aromatic nitro-compounds by). 42. 
SÖHNGEN (N. L.). The splitting up of ureum in the absence of albumen. 513. 
SOLAR-ACTIVITY (On Lockyer’s 35-year period in the). 842. 
SOLAR vortices of Hare (The). 592. 
SOLARIZATION PHENOMENON (A contribution to our knowledge of the) and of some 
other properties of the latent image. 2. 
SOLID STATE (On the). 765. 
SONDÉ and Trinil (The age of the layers) on Java. 185. 
SPACIAL FIGURE (The P-7-X-) for a system of two components which are miscible in 
the solid or liquid erystalline state in all proportions. 165. 
SPECTROHELIOGRAPH (Anomalous refraction phenomena investigated with the). 213. 
SPECTRUM of iron (The ZeEMAN-eftect of the strong lines of the violet spark) in the 
region A 2380—a 4416. 222. 
SPINISPIRAE (On the) of Spirastrella bistellata (O.S.) Ldfd. 642. 
SPIRASTRELLA BISTELLATA (O.S.) Ldfd. (On the Spinispirae of), 642. 
SPRONCK (C. H. H.) presents a paper of Dr. J, G. SueeswijK: “Contributions to 
. Ist Communication. 621. 2nd Communication. 784, 
be) 
the study of serumanaphylaxis’ 
3rd Communication. 859. 
ahd 
