CON PEN PS; XIII 
REINDERS (W.). Mixed crystals of mercuric iodide and bromide. 81. 146. 
RESISTANCE (On the power of) of the red blood-corpuscles. 574, 
— (The Harr-effect and the increase of) of bismuth in the magnetic field at very 
low temperatures. 228. 229. 348, 
RESPIRATION (Some reflexes on the) in connection with LaBorpe’s method to restore, 
by rhythmical traction of the tongue, the respiration suppressed in narcosis. 640, 
RESORPTION (The) of fat and soap in the large and the small intestine. 234. 287, 
RESULTANT (The formation of the). 85. 
RHYTHMICAL TRACTION of the tongue (Some reflexes on the respiration in connection 
with LABORDE’s method, to restore by), the respiration suppressed in narcosis, 640. 
ROMBURGH (P. VAN). On the nitration of dimethylaniline dissolved in concen- 
trated sulphuric acid. 342. 
— On the formation of indigo from Indigoferas and from Marsdenia tinetoria. 344. 
roots (New theorems on the) of the functions Co (2): 196. 
ROOZEBOOM (H. W. BAKHUTS). See Baksuis Roozesoom (H. W.). 
SABANG-BAY, Sumatra (Tidal constants in the Lampong- and). 178. 
SALT (Formation and transformation of the double) of Silvernitrate and Thalliumnitrate. 
468. 480. 
saLts (On the nitration of benzoic acid and its methylic and ethylic). 4. 
SANDE BAKHUYZEN (E. F. VAN DE) presents a paper of C. SANDERS: /Deter- 
mination of the latitude of Ambriz and of San Salvador (Portuguese West- 
Africa). 398. 
SANDE BAKHUYZEN (8. G. VAN DE) presents a paper of H. J. Zwregs 
„The system of Sirius according to the latest observations.” 6. 
—- On the finding back of the comet of Holmes according to the computations of 
H. J. Zwrers. 69. 
— presents a paper of J. Weeper: The 14-monthly period of the pole of the 
earth from determinations of the azimuth of the meridian marks of the Leiden 
Observatory from 1882—1896.” 546. 
SANDERS (c.). Determination of the latitude of Ambriz and of San Salvador (Por- 
tuguese West-Africa). 398. 
SAN SALVADOR (Portuguese West-Africa) (Determination of the latitude of Ambriz and 
of). 398. 
SCHOUTE (P. H.). On rational twisted curves. 421. 
— On the locus of the centre of hyperspherical curvature for the normal curve of 
n-dimensional space. 527. 
— The theorem of JOACHIMSTHAL of the normal curves. 593. 
SCHREINEMAKERS (F. A. H.). On the system: water, phencl, acetone. 1. 
— The constitution of the vaponrphase in the system: Water-Phenol, with one or 
two liquidphases. 645. 
SEA-LEVEL (On the relation between the mean) and the height of half-tide. 189. 
SERIES (The continuation of one-valued function represented by a double). 24. 
SIERTSEMA (1. H.). Measurements on the magnetic rotation of the plane of polari- 
sation in oxygen at different pressures. 19. 
