Ir CO NOL ENS Se 
BENZOL SULFONIC ACID (On the sulfonisatiou of). 511. 
BEI ERINCK (M. W.). Fixation of free atmospheric nitrogen by Azotobacter in 
pure culture. Distribution of this bacterium, 67. 
BICUSPIDAL CURVES (On) of order four. 499. 
BILDERBEEK —VAN MEURS (H. B. VAN). The Zeeman-eflect of the strong 
lines of the violet spark spectrum of iron in the region A 2380—A 4416. 222. 
BINARY MIxTURES (Contribution to the theory of). VII. 146. VILLE 187. TX, 20 
X. 319. XL 426. MAL. 417. KUT 698. R116 ZENE BA, 
BINARY MIXTURES (Isotherms of diatomic gases and their). VILI. The breaking stress 
of glass and the use of glass tubes in measurements under high pressure at 
ordinary and low temperatures. 30. 
BINARY SYSTEMS (On the course of the isobars of). 599. Ii. 799. ILL. 906. 
BLAAUW (A. H.). On the relation between the intensity of light and the length of 
illumination in the phototropic curvatures in seedlings of Avena sativa, 230. 
BLANKSMA (J. J.). Reduction of aromatic nitro-compounds by sodium disulphide. 42. 
BLOOD-CORPUSCLES (The permeability of ) to calcium. 718. 
BOEKE (J.). On the structure of the ganglion-cells in the central nervous system of 
Branchiostoma lane, 53. 
BOILING POINTS (On the standardizing of temperatures by means of) of pure sub- 
stances. 333. 
BOLK (L.) presents a paper of Dr. A. J. P. VAN DEN BROEK; “About the deve- 
lopment of the urogenital canal (arethra) in man”. 494, 
BORING-SPONGE (Poterion a). 37. 
BORNEO (The mineralogie and chemical composition of some rocks from central). 398 
Botany. Tu. VALETON : “Lindeniopsis. A new subgenus of the Rubiaceae”. 123, 
— S. H. Koorpers: ‘Contribution No. | to the knowledge of the flora of Java” 
3rd Continuation. 129. 4th Continuation. 158. 
— F.A F.C. Went: “On the investigations of Mr. A. H. Buaauw on the relation 
between the intensity of light and the length of illumination in the phototropic 
curvatures in seedlings of Avena sativa”, 230. 
— J. M. Geerts: “Contribution to the knowledge of the cytological development 
of Oenothera Lamarckiana”. 267. 
— S, H. Koorpers: “Some systematic and phytogeographical notes on the Java- 
nese Casuarinaceae, especially of the State Herbaria at Leiden and at Utrecht”, 415. 
— W. Burck: “On the biological significance of the secretion of nectar in the 
flower’, 445. 
— Miss T. Tammes: “Dipsacan and Dipsacotin, a new chromogen and a new 
colouring-matter of Dipsaceae’’. 509. 
__ F. A. F. C. Wert: “Some remarks on Sciaphila nana Bl”. 590, 
— J. W. Morr: “Carbon dioxide transport in leaves”. 649. 
— S. H. Kooupers: “Polyporandra Junghuhnii, a hitherto undescribed species of 
the order of Icacinaceae,; found in ’s Rijks Herbarium at Leiden.” 763. 
BOUMAN (gz. P.). A family of differential equations of the first order. 847, 
