XXX CON TEN: TS 
RONTGENRAYS (Research by means of) on the structure of the crystals of 
lithium and some of its compounds with light elements. I. 1365. 
RuTGERs (K. W.). Degenerations in linear systems of plane cubics. 797. 
RUTHENIUM (Colloidal sulphurcompounds of). 95. 
RuTTEN (L.). On the occurrence of Halimeda in old-miocene coastreefs 
of East-Borneo. 506. 
— Quaternary and tertiary limestones of North-New Guinea between the 
Tami-, and the Biri-river basins. 1137. 
— On the age of the tertiary oil-bearing deposits of the peninsula of 
Klias and Pulu Labuan (N.W. Borneo). 1142. 
RIJNBERK (G. VAN) presents a paper of Mr. J. BRAMSON: “Experimental 
proof for the active dilatation of cross-striated muscle-tissue.” 111. 
— presents a paper of Miss Lucie W. ScnuT: “Factors which are of 
importance for the habitformation of birds. I. Visual sensations.” 338. 
SALOMONSON (I. K. A. WERTHEIM) presents a paper of Dr. S. DE 
Boer: “On fibrillation of the heart.” I. 319. II. “On the relation between 
fibrillation of the heart and “Gehäufte” extra-systoles.” 329. III: 
“Ventricular fibrillation and “Gehäufte” extra-systoles of the ventricle 
excited by the ‘“Erregung’” consequent on an artificial auricular 
systole.” 533. 
— The limit of sensitiveness of the String-galvanometer. (2d communi- 
cation). 613. 
— The mechanism of the automatic current interrupter. 869. 
SaLts (The photochemical decomposition of potassium-cobaltioxalate and 
its catalysis by neutral). 84. 
SARDINIEN (Bemerkungen über einige Säugetierschädel von). 37. 
SäUGETIERSCHÄDEL (Bemerkungen über einige) von Sardinien. 37. 
SCHOUTEN (J. A). On geodesic precession. 1108. 
SCHOUTISSEN (H. A. J.), J. BOESEKEN and W. F. BRANDSMA. The velocity 
of the diazotisation reaction as a contribution to the problem of 
substitution in the benzene nucleus. 249. 
SCHREINEMAKERS (F. A. H.). In-, mono- and divariant equilibria. 
NK altal. 
SCHUT (Miss Lucie W.). Factors which are of importance for the 
habitformation of birds. I. Visual sensations. 338. 
SENSIBILIZATION (On) to radioactivity by the action of hormones. 838. 
SENSITIVENESS (The limit of) of the String-galvanometer. 613. 
SERIES triSonométriques (Sur une propriété de). 220. 
SEROLOGICAL specificity (On the) of haemoglobin in different species of 
animals. 1161. 
