VI CO NT Er Noes 
cuBics (Two null systems determined by a net of). 1124. 
CURRENT POTENTIALS as electrolyte solutions. 2nd Communication. 1021. 
curRkENTs (Che) arising in z-coupled circuits when the primary current is suddenly 
broken or completed, 225. 
pares (Calculation of) in the Babylonian tables of planets. 684. 
DEBYE (Note on the model of the hydrogen-molecule of Bour and). 480. 
DEFLECTION (Electric current measuring instruments with parabolic law of). 896. 
DELSMAN (H. C.). On the relation of the first three cleavage planes to the 
principal axes in the embryo of Rana fusca Rösel. 498. 
— The gastrulation of Rana esculenta and of Rana fusca. 906. 
— On the relation of the anus to the blastopore and on the origin of the tail in 
vertebrates. 1256. 
pENsITY (The influence of accidental deviations of) on the equation of state. 1312. 
DERMATOMES of the hindleg (The structure and overlap of the) with the cat. 321. 
DIFFUSION (On) in solutions. | 148. 
DIGITALIS (Contribution to the knowledge of the influence of) on the frog’s heart. 1029. 
DILATATION (The) of solid bodies by heat. 1324. 
DIPTERAWINGS (The colourpattern on). 1141. 
DISTANCE-RELATIONS in the effects of Radium-radiation on the isolated heart. 1161. 
pivisor (The primitive) of am—1, 785, 
DROOGLEEVER FORTUYN (C. E.)—VAN LEYDEN. Some observations on 
periodic nuclear division in the cat. 38. 
— On an eel, having its left eye in the lower jaw. 1120. 
‘DROSTE (J.). The field of a single centre in Einstein's theory of gravitation, and 
the motion of a particle in that field. 197. 
— The field of x moving centres in EiNsTEIN’s theory of gravitation. 447. 
EEL (On an), having its left eye in the lower jaw. 1120. | 
EHRENFEST (P.). On adiabatic changes of a system in connection with the 
quantum theory. 576. 
EINSTEIN (The equations of the theory of electrons in a gravitation field of) 
deduced from a variation principle. 892. 
EINSTEI1N’S theory (Planetary motion and the motion of the moon according 
to). 367. 
— (On the relativity of rotation in). 527. 
EINSTEINS theory of gravitation, (The field of a single centre in) and the motion 
of a particle in that field. 197. 
— (On) L. 1341. IL. 1354. 
— (The field of ~ moving centres in). 447. 
— (On HAMILTON’s principle in). 751. 
— and Herctorz’s mechanics of continua. 884. 
EINSTEIN’S latest hypothesis (Remarks concerning). 1217. 
ELASTIC BODY. (On the use of Third Degree terms in the energy of a deformed). 281. 
ELECTRIC current (Fibrin-excretion under the influence of an). 900. 
ELECTRIC current measuring instruments with parabolic law of deflection. 896. 
