X C10 AN C4 EN NT 5 
SURFACE LAYERS on mercury (The optical investigation of) and a more 
refined method of observation with BABINET’s compensator. 108. 
TEMPERATUREN (Weitere physiologische Versuche mit niederen). 192. 
TEMPERATURES (On the equation of state for arbitrary) and volumes. III. 
On the law of force between the molecules of mon-atomic sub- 
stances. 294. 
TOLLENAAR (D.) and A. H. Braauw. Light- and dark-adaptation of a 
plant cell. 17. 
Tonus of the skeletal muscle (On the action of the novocain on the). 185. 
VERSUCHE (Weitere physiologische) mit niederen Temperaturen. 192. 
VOLUMES (On the equation of state for arbitrary temperatures and). III. On 
the law of force between the molecules of mon-atomic sub- 
stances. 294. 
Vries (HK. DE) presents a paper of Dr. J. W. N. Le Heux: “Explanation 
of some interference-curves of uni-axial and bi-axial crystals by super- 
position of elliptic pencils.” (Second paper). 195. 
VRIES (JAN DE). Involutorial correspondences (2.2) of the first class. 12. 
— presents a paper of Prof. J. A. SCHOUTEN and D. J. Struik: “On 
curvature and invariants of deformation of a V, in V,. 146. 
WATERINTERFEROMETER (RAYLEIGH-LöweE) (The use of the Zeiss) for the 
analysis of non-aqueous solutions. 114. 
WEEVERS (TH.). Concerning the influence of light and gravitation on 
pellia epiphylla. 2. 
Went (F. A. F. C.) presents a paper of Dr. TH. WEEVERS: “Concerning 
the influence of light and gravitation on pellia epiphylla.” 2. 
— presents a paper of Mr. V.J. KoNINGSBERGER: “A method of recording 
growth under various external influences.” 209. 
WERTHEIM, SALOMONSON (I. K. A.) v. SALOMONSON (I. K. A. 
WERTHEIM). 
Wisaut (J. P.). On the behaviour of amorphous carbon and sulphur at 
high temperatures and on carbon-sulphides. 92. 
WiersMaA (E. D.). Psychical inhibition. 33. 
Woupe (W. VAN DER). On the path of a ray of light in the field of 
gravitation of a single material centre. 187. 
ZALMANN (J. H.). Concerning an isolated muscle of the ciliary body 
of the pigeon’s eye, situated near the eye-split. 123. 
ZEEMAN (P.) presents a paper of Prof. A. Smits and C. J. DE GRUYTER: 
“The electromotive behaviour of aluminium.” III. 86. 
— and G. C. Dispetz Jr. An interference phenomenon due to the intro- 
duction of sodium vapour into one of the paths of the FIZEAU-MICHELSON 
interferometer-arrangement. 206. 
