XXII CONTENTS. 
TROCHLEAR ROOT (Notes on the trochlear and oculomotor nuclei and the) in the lower 
vertebrates. 897. 
TRYPSIN (On the stimulating effect of chloride of calcium and of intestinal mucous 
membrane extract on the action of). 1002. 
TRYPTOPHANE (Hypaphorine and the relation of this substance with). 1177. 
TUMOUR (A) in the pulvinar thalami optici. A contribution to the knowledge of the 
vision of forms. 928. 
UREOPROPYLENE-UREÏNE (Aminvu- and). 625. 
UVEN (M. J. vAN). Infinitesimal iteration of reciprocal functions. 21. 202. 
VALETON (J. J. P.). The melting diagram of the system of the three isomeric 
nitranilines. 429. 
VALETON (3. 3. P.), A. F. HOLLEMAN and T. van DER LINDEN. On a method for 
the quantitative analysis of ternary mixtures. 429. 
VALKENBURG (c. T. VAN) Nucleus facialis dorsalis, nucleus trigemini posterior, 
nucleus trochlearis posterior. 143. 
VAPOUR-PRESSURES above — 140° C. critical temperature and critical pressure of 
argon. 54. 
VAPOUR-PRESSUREs (On) in binary systems with partial miscibility of the liquids. 865. 
Addendum. 957. 
VECTOR-DISTRIBUTIONS (On continuous) on surfaces, 3rd Communication. 171, 
VELOCITIES of reaction (Thermodynamic potential and). 789. 
VERSCHAFFELT (@D.). The cause determining the selection of food in some her- 
bivorous insects. 536. 
— The mechanism of the absorption of water by the seeds of the Cucurbitaceae. 542. 
VERTEBRATES (Notes on the trochlear and oculomotor nuclei and the trochlear root 
in the lower). 897. 
— (Remarks on the reticular cells of the oblongata in different). 1047. 
VERTICES (On the relation between the) of a definite sixdimensional polytope and the 
lines of a cubic surface. 375. 
VIBRATIONS (The oscillations about a position of equilibrium where a simple linear 
relation exists between the frequencies of). 742. 
VISION OF FoRMs (A contribution to the knowledge of the). 928. 
VOLCANIC ERUPTION (On the) in the island of Téon (Tijau) in 1659. 485. 
VOSMAER (G. C. 3.). Observations of the genus Spirastrella. 1139. 
VRIES (HUGO Der) presents a paper of Mr. H. H. Zeyisrra Fan: “On the cause 
of dimorphism in Oenothera nanella.” 650. 
VRIES (JAN DE) presents a paper of Dr. M. J. van Uven: “Infinitesimal iteration 
of reciprocal fuuctions,” 21. 
— On linear polar groups belonging to a biquadratic plane curve. 44. 
— A quadruple involution in the plane and a triple involution connected with it. 82. 
— presents a paper of Dr. M. J. van Uven: “Infinitesimal iteration of reciprocal 
functions”. 202. ; 
— presents a paper of Prof, Grorae Mascen: “On quartic curves of deficiency 
zero with a rhamphoid cusp and a node”. 652. 
