GON TEEN DTS Vv 
ITERSON JR. (iG VAN) presents a paper of Dr.C. E. B. BREMEKAMP: "On 
-anti-phototropic curvatures occurring in the coleoptiles of Avena”. 177. 
Jurius (W. H.) presents a paper of Mr. H. Groot: Gravity and pressure 
of radiation”. 64. 
KAISER (Miss L.). Muscle sound in birds. 78. 
— A simple method to obtain a curve of the contraction of the M. 
arrectores pilorum. 81. 
KAMERLINGH ONNES (H.). v. ONNEs (H. KAMERLINGH). 
KEESOM (W. H.). On the calculation of the molecular quadrupole-moments 
from the equation of state. 162. 
KEUTVER (J.C) presents a paper of Prof. W. vaN DER Woupe: “On 
the path of a ray of light in the field of gravitation of a single material 
centre.” 187. 
KONINGSBERGER (V. J.). A method of recording growth under various 
external influences. 209. 
KUENEN (J. P.) presents a paper of Mr. P. GirBERT RAHM: “Weitere 
physiologische Versuche mit niederen Temperaturen.” 192. 
LAAR (J. J. vAN). On the equation of state for arbitrary temperatures and 
volumes. III. On the law of force between the molecules of mon- 
atomic substances. 294. 
LAHAR (mud flow) (On the hot) of the valley of ten thousand smokes. 
(Alaska). 282. 
LANDSTEINER (K.). On the formation of heterogenetic antigen by 
combination of hapten and protein. 237. 
LAw- OF FORCE (On the) between the molecules of mon-atomic sub- 
stances. 294. 
LicHt (Concerning the influence of) and gravitation on pellia epiphylla. 2. 
— and dark-adaptation of a plant cell. 17. 
— (On the path of a ray of) in the field of gravitation of a single 
material centre. 187. 
Loon (CHR. VAN), DERX, HERMANS and J. BOESEKEN. The condition of 
motion of the molecules in space. 198. 
LORENTZ (H. A.) presents a paper of Mr. C. A. REESER and Prof. R. 
SISSINGH: “An extension of the theory of BABINET’s compensator.” 102. 
— presents a paper of Mr. C. A. REEsER and Prof. R. SissincH: “The 
optical investigation of surface layers on mercury and a more refined 
method of observation with BABINET’s compensator.” 108. 
— presents a paper of Dr. J. J. vaN LAAR: “On the equation of state 
for arbitrary temperatures and volumes. III. On the law of force 
between the molecules of mon-atomic substances.” 294. 
— Double refraction by regular crystals. 333. 
