XXVI CONTENTS 
TRADE WINDS (On the relation between the fluctuations in the strength of the) of 
the North Atlantic Ocean in summer and departures from the normal of the 
wintertemperature in Europa. 1435. 
TRANSIT OF MERCURY (Observation of the moon during the eclipse of the sun on 
Aug. 21 1914 and of the) on Novb. 7, 1914 made in the Leiden Observatory. 16. 
TREE (Sloanea Javanica (Miquel) Sszyszylowicz, a remarkable) growing wild in the 
jungle of Depok, which is maintained as a nature reserve. Contributions to the 
flora of Java. VIIL 521. 
TRILOBITE FAUNA (On a) of presumably devonian age in the Dutch East Indies near 
Kaloeé (Famiang district S. W. Atjeh). 1632. 
TRUNKDERMATOMES (On the structure and covering of the) of the cat, 1133. 
TURBULENT MOTION of fluids (An optical method for determining the ratio between 
the mean and maximal velocities in the). 1240. 
TWISTED CUBICS (A simply infinite system of). 1464. 
TWISTED CURVES (Bilinear congruences of), which are determined by nets of cubic 
surfaces. 431. 
TWISTED QUARTICs (On) passing through eight associated points. 1147. 
TWISTED QuINTICs (A particular bilinear congruence of rational). 39. 
— (Bilinear, congruences of elliptic and hyperelliptic). 43. 
VAGUS and hypoglossus area (On the) of Phocaena communis, 965. 
vaGus-AREA (The) in Camelopardalus Giraffe. 647. 
VALENCY-LAW (On the validity of Maruews’ so-called). 1235. 
VANADIUMPENTOXIDE (Double refractive sol of), 1625. 
VELOCITY of ions at 0° C. 375. 
VERKADE (P. E.. Glutaconic acid. I. 981. II, 1527. 
VERMEULEN (U. A.). The vagus-area in Camelopardalus Girafte. 647. 
— On the conus medullaris of the domestie animals. 750. 
— On the vagus and hypoglossus area of Phocaena communis. 965. 
— Concerning the nervus sympathicus of domestic animals. 1191. 
VERSCHAFFELT (J. u.). The viscosity of liquefied gases. I. 840. IT. 860, HI. 1038. 
— and Cu. Nicatse. The viscosity of liquefied gases. IV. 1659. 
VERTEBRATES (Critical and theoretical considerations about the origin of the primary 
foetai membranes in). 1604. 
VIRIAL COEFFICIENT (The second) for rigid spherical molecules whose mutual attrac— 
tion is equivalent to that of a quadruplet placed at their centre. 636. 
-— (Two theorems concerning the second) for rigid spherical molecules which 
besides collisional forces only exert CouLoMB-forces, and for which the total 
charge of the active agent is zero. 868. 
— (On the second) for rigid spherical molecules carrying quadruplets. 1568. 
viscosity (The) of colloidal solutions. 170. 
— (The) of liquefied gases. I. 840. IT. 860. IIL. 1038. LV. 1659. 
VOLCANISM (How) might be explained. 10. 
VOLTERRA (On a linear integral equation of) of the first kind, whose kernel 
contains a function of BrssEL. 769. 
