XX CONTENTS. 



TEKPENE ALCOHOLS (On some aliphatic). 723. 



TERPENES (On Ocimene and Myrcene, a contribution to the knowledge of the alipluitio). 7 1-t. 



TETHYA LYNCURIUM (The stvli of). 15. 



TETRAHEDRAL COMPLEX (An article on the knowledge of the). 358. 



THALICTEUM AQCiLEGii'OLiUM, a hvdrogeu cyanide-yieUling plant. 337. 



THEORY of reflection of light (On the) by imperfectly transparent bodies. 377. 



THOMSON-EFFECT (Determination of the) in mercury. 331. 



TIMOR (On a new species of Corallium from). 268. 



TOLDENE (The bromination of). 512. 



TONES (On the ability of distinguishing intensities of). 421. 



TRANSIT of Venus (Supplement to the account of the determination of the longitude 



of St. Denis (Island of Reunion), executed in 1874, containing also a general 



account of the observation of the). 110. 

 TRIANGLES (Approximate formulae of a high degree of accuracy for the ratio of the) 



in the determination of an elliptic orbit from three observations. U. 104. 

 TRIBROMOXYLENES (On the six isomeric). 153. 



ULTEE (a. J.). On the action of hydrocyanic acid on ketones. 141. 

 UTERUS (The) of Erinaceus europaeus L. after parturition. 812. 

 VENUS (Supplement to the account of the determination of the longitude of St. Denis 



(Island of Reunion), executed in 1874, containing also a general account of the 



observation of the transit of). 110. 

 VERSCHAFFELT (e.). Some obs3rvations on the longitudinal growth of stems and 



flower-stalks. 8. 

 VERSCHAFFELT (j. e). Contributions to the knowledge of van deu Waals' 



)J/-surface. X. On the possibility of predicting the properties of mixtures from 



those of the components. 743. 



— Appendix to the communications published in the meetings of June 28, Sep- 

 tember 27, 1902 and October 31, 1903. 752. 



VEBSLUYS (w. A.). On the rank of the section of two algebraic surfaces. 52. 



— On the number of common tangents of a curve and a surface. 176. 



— The PiA'CKER equivalents of a cyclic point of a twisted curve. 498. 

 vertebrates (The designs on the skin of the), considered in their connection with 



the theory of segmentation. 307. 

 VIBRATION (On the propagation of light in a biaxial crystal around a centre of). 728. 

 v o I G T (A simple geometrical deduction ot the relations existing between known and 



unknown quantities, mentioned in the method of) for determining the conduc- 



tibility of heat in crystals. 793. 

 V o s M A E R (g. c. J.) and H. P. Wijsman. On the structure of some siliceous 



spicules of sponges. I. The styli of Tethya lyncurium. 15. 

 VBIES (h. d e). Central projection in the space of Lobatschefskï. 1st part. 389. 

 TRIES (hogo de) presents a communication of Prof. E. Verschaffelt : "Some 



observations on the longitudinal growth of stems and flower-stalks"'. 8. 

 VRIES (JAN Ü e). On pencils of algebraic surfaces, 29. 



