Iv C 10 AN ST TEN Gre 
GEL of agar-agar (On the movement of pepsin in a protein-containing or 
protein-free). 269. 
GELDEREN (CHR. VAN). On the development of the sternum in 
reptiles. 221. . 
Geology. B. G. EscHER: “On the hot lahar (mud flow) of the valley of 
ten thousand smokes. (Alaska).”’ 282. 
GRAVITATION (Concerning the influence of light and) on pellia epiphylla. 2. 
— (On the path of a ray of light in the field of) of a single material 
centre. 187. 
GRAVITY and pressure of radiation. 64. 
Groort (H.). Gravity and pressure of radiation. 64. 
GRUYTER (C. J. DE) and A. Smits. The electromotive behaviour of alumi- 
nium. III. 86. 
HaGaA (H.) presents a paper of Prof. F. ZERNIKE: “A moving coil galvano- 
meter Of high sensitivity.’ 239. 
HAPTEN and protein (On the formation of heterogenetic antigen by com- 
bination of). 237. 
HERMANS, J. BOESEKEN, CHR. VAN LOON and Derx. The condition of 
motion of the molecules in space. 198. 
Heux (J. W. N. Le). Explanation of some interference-curves of uni- 
axial and bi-axial crystals by superposition of elliptic pencils. (Second 
paper). 195. 
Hins (C. H.). On a change with the declination in the personal equation 
in meridian-observations. 168. : 
HOLLEMAN (A. F.) presents a paper of Dr. J. P. Wisaut: “On the 
behaviour of amorphous carbon and sulphur at high temperatures and 
on carbon sulphides.” 92. 
HOMO-NEANDERTALENSIS (On the cranial form of) and of pithecanthropus 
erectus, determined by mechanical factors. 313. 
INHIBITION (Psychical). 33. 
INTEGRAL NOTION (On an) of DENJoy. 131. 
INTERFERENCE-curves (Explanation of some) of uni-axial and bi-axial crystals 
by superposition of elliptic pencils. (Second paper). 195. 
INTERFERENCE-PHENOMENON (An) due to the introduction of sodium vapour 
into one of the paths of the FizEAU-MICHELSON interferometer-arran- 
gement. 206. 
INTERFEROMETER-arrangement (An interference phenomenon due to the 
introduction of sodium vapour into one of the paths of the FizEAu- 
MICHELSON). 206. 
INVOLUTORIAL-CORRESPONDENCES (2,2) of the first class. 12. 
Iris (Regarding automatic movements of the isolated). 84. 
