XVI CMO NOP ECN Ass; 
TOLUOL (On the bromation of). 511. 
TRANSFORMATIONS of surfaces (Continuous one-one) in themselves. 788. 
TRINIL (The age of the layers of Sondé and) on Java. 185. 
TRIPLE SYSTEMS (On), particularly those of thirteen elements. 290. 
TRIPLET (The Jaw of shift of the central component of a) in a magnetic field. 473. 
TRIVELLI (A. P. H.). A contribution to our knowledge of the solarization pheno- 
menon and of some other properties of the latent image. 2. . 
— A contribution to the photochemistry of silver (sub-) haloids. 730. 
TWISTED CURVE (The piane curve of order 4 with 2 or 3 cusps and 0 or | nodes as 
a projection of the) of order 4 and of the Ist species. 627. 
TWISTED CURVES (Congruences of) in connection with u cubic transformation. 84. 
URETHANE (On the phenomena of condensation for mixtures of carbonic acid and), in 
connection with double retrograde condensation. 913. 
UREUM (The splitting up of) in the absence of albumen. 513. 
UROGENITAL CANAL (urethra) in man (About the development of the). 494. 
VALETON (TH). Lindeniopsis. A new subgenus of the Rubiaceae. 123. 
VAPOUR PRESSURE (The determination of the) of oxygen at three temperatures. 333. 
VECTOR-DISTRIBUTIONS (On continuous) on surfaces. 850. 
vorGT (w.). Remarks on the Leiden observations of the ZEEMAN-eflect at low tem- 
peratures. 360. 
VOSMAER (G, C. J.). Poterion a boring-sponge. 37. 
— presents a paper of Dr. J. Boeke: “On the structure of the ganglion-cells in 
the central nervous system of Branchiostoma lane.” 53. | 
— On the spinispirae of Spirastrella bistellata (O. S.) Ldfd. 642. 
VRIES (H. DE). The plane curve of order 4 with 2 or 3 cusps and 0 or 1 nodes 
as a projection of the twisted curve of order 4 and of the lst species. 627. 
VRIES (JAN DE). Congruences of twisted curves in connection with a cubic trans- 
formation. 84. 
— presents a paper of M. Sruyvagrr; “On certain twisted sextics.” 346. 
— On bicuspidal curves of order four. 499. 
— On curves of order four with four fleenodal points or with two biflecnodal 
points.” 568. 
— On curves which can be generated by projective involutions of rays. 576. 
— A family of differential equations of the first order, 756. 
— presents a paper of Dr. Z. P. Bouman: “A family of differential equations of 
the first order.” 847. 
WAALS (J. D. VAN DER) presents a paper of Prof. J. D. van DER Waals Jr.: 
“On the law of molecular attraction for electrical double points.” 132. 315. 
— Contribution to the theory of binary mixtures. VII. 146. VIIL. 187. IX. 201. 
X. 317. XL 426. XII. 477. XIII. 698. XIV. 816. XV. 890. 
— presents a paper of Prof. A. Smits: “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, 
