CTOPNITIEVNVICS Ill 
CrysraLs (Explanation of some interference-curves of uni-axial and bi-axial) 
by superposition of elliptic pencils. (Second paper). 195. 
— (Double refraction by regular). 333. 
CurvaTurE (On) and invariants of deformation of a Vm in Vn. 146. 
— (On anti-phototropic) occurring in the coleoptiles of Avena. 177. 
Curve (A simple method to obtain a) of the contraction of the M. arrectores 
pilorum. 81. 
DARK-ADAPTATION (Light-and) of a plant cell. 17. 
DECLINATION (On a change with the) in the personal equation in meridian- 
observations. 168. 
DEFORMATION of a Vm in Vn (On curvature and invariants of). 146. 
DENJOy (On an integral notion of). 131. 
DerRx, Hermans, J. BOESEKEN and CHR. vAN Loon. The condition of 
motion of the molecules in space. 198. 
DiBBEeTz Jr. (G. C.) and P. ZEEMAN. An interference phenomenon due 
to the introduction of sodium vapour into one of the paths of the 
FizEAU MICHELSON interferometer-arrangement. 206. 
DuBois (EuG.). On the cranial form of homo neandertalensis and of 
pithecanthropus erectus, determined by mechanical factors. 313. 
DWARF-HYACINTHS (On hypotriploid) derived from triploid dutch variaties 
through somatic variation. 251. 
ELECTROMOTIVE behaviour (The) of aluminium. III. 86. 
ELLIPTIC PENCILS (Explanation of some interference-curves of uni- axial and 
bi-axial crystals by superposition of). (Second paper). 195. 
EQUATION OF STATE (On the calculation of the molecular quadrupole- 
moments from the). 162. 
— (On the) for arbitrary temperatures and volumes. III. On the law of 
force between the molecules of mon-atomic substances. 294. 
EscuHer (B. G.). On the hot lahar (mud flow) of the valley of ten 
thousand smokes (Alaska). 282. 
Eye-spuit (Concerning an isolated muscle of the ciliary body of the pigeon’s 
eye, situated near the). 123. 
FieLp of gravitation (On the path of a ray of light in the) of a single 
material centre. 187. 
F12EAU-MICHELSON (An interference phenomenon due to the introduction 
of sodium vapour into one of the paths of the) interferometer- 
arrangement. 206. 
FoorcLoNus (Simple and alternating). 47. 
Funaia fungites and fungia actiniformis (On budding and coalescence of 
buds in). 257. 
GALVANOMETER (A moving coil) of high sensitivity. 239. 
23% 
