XVIIL CONTENTS: 
RATIONAL CONES of the complex (On a group of complexes with), 577. 
rays (A group of algebraic complexes of). 627. 
REACTION (The) of FriepEL and Crarts. 470. 
REFRACTION (Double) near the components of absorption-lines magnetically split into 
several components, 435. 
REVERSION (An interesting case of). 90. 
ROOZEBOOM (i. W. BAK HUIS). v. BaKmurs RoozeBoom (H. W.). 
SALICYLACID synthese (The mechanism of the). 63. 
SANDE BAKHUYZEN (H. G. VAN DE) presents a paper of C, Easton: “On 
the apparent distribution of the nebulae”. 117. 
— presents a paper of C, Easton: “The nebulae considered in relation to the 
galactic system”. 125. 
— presents a paper of J. Weeper: “A new method of interpolation with com- 
pensation applied to the reduction of the corrections and the rates of the 
standardoloek of the Observatory at Leyden, Hohwii 17, determined by the 
observations with the transitcircle in 1903”. 241. 
— presents a paper of J. WeEDER: “Approximate formulae of a high degree of 
accuracy for the relations of the triangles in the determination of an elliptic 
orbit from three observations”. 752. 
SARCINA (An obligative anaerobic fermentation). 580. 
SCHOUTE (Pe. H.). On the equation determining the angles of two polydimensional 
spaces. 340. 
— The formulae of GULDIN in polydimensional space. 487. 
— On non-linear systems of spherical spaces touching one another. 562. 
— presents a paper of Prof. R. MeumKE: “On moments of inertia and moments of 
an arbitrary order in spaces of arbitrary high rank”. 596. 
SCHUH (FRED.). On an expression for the class of an algebraic plane curve with 
higher singularities. 42. 
— On an expression for the genus of an algebraic plane curve with higher singu- 
larities. 107. 
— On the curves of a pencil touching an algebraic plane curve with higher sin- 
gularities. 112. 
SCLEROTIOPSIS PITYOPHILA (Corda) Oud. (On), a Sphaeropsidea occurring on the 
needles of Pinus silvestris. 211. 
: ; ge(1) 
SERIES derived from the series Dar 66. 
sILICATES (On the composition of the) in the soil which have been formed from the 
disintegration of the minerals in the rocks. 329. 
SILICON (The preparation of) and its chloride. 189. 
SMITS (A). On the phenomena appearing when in a binary system the plaitpoint- 
curve meets the solubilityeurve. (3rd communication). 177. 
SOLAR ACTIVITY (Oscillations of the) and the climate. 368. 
SOLUBILITY curve (On the phenomena appearing when in a binary system the plait- 
pointcurve meets the). 177. 
