242 
F. M. JAEGER: “Investigations on the Temperature-Coefficients of the Free Molecular Surface-Energy 
of Liquids between —80° and 1650° C.” XVII. The relations between the Molecular Cohesion of 
Liquids at their Melting- and Boilingpoints, and their absolute Melting- and Boiling-temperatures 
respectively, p. 405. 
C. M. HOOGENBOOM: “On the influence of an electric field on the light transmitted and dispersed 
by clouds.” (Communicated by Prof. P. ZEEMAN), p. 415. 
A. SMITS and F. E. C. SCHEFFER: “The Interpretation of the Röntgenograms and Röntgenspectra 
of Crystals.” (Communicated by Prof J. D. VAN DER WAALS), p. 432. (With two plates). 
H R. KRUYT and W. D. HELDERMAN: “The equilibrium solid-liquid-gas in binary systems which 
present mixed crystals.” (Third communication) (Communicated by Prof. ERNST COHEN), p. 439. 
J. DROSTE: “The field of m moving centres in EINSTEIN’s theory of gravitation.” (Communicated by 
Prof. H. A. LORENTZ), p 447. 
E. BROUWER: “Researches on the function of the sinus venosus of the frog’s heart.” (Communicated 
by Prof. H. J. HAMBURGER), p. 455. - 
C. SANDERS: “Contributions towards the determination of geographical positions on the West- 
coast of Africa.” IV. (Communicated by Prof. E. F. VAN DE SANDE BAKHUYZEN), p. 465. 
J. M. BURGERS: “Note on the model of the hydrogen-molecule of BOHR and DEBIJE”. (Communi- 
cated by Prof. H. A. LORENTZ), p. 480. 
J. G. VAN DER CORPUT:.“On the values which the function 2 (s) assumes for s positive and odd”. 
(Communicated by Prof. J. C. KLUYVER). p. 489. 
Geology. — “On the tectonics of the eastern Moluccas’. By Dr. 
H. A. Brouwer. (Communicated by Prof. G. A. F. MOLENGRAAFF). 
(Communicated in the meeting of November 27, 1915). 
During geological expeditions, which in the year 1915 I performed 
on various islands of the Moluceas'), | obtained numerous data 
that are important for the tectonic structure, of the country travelled 
over. As the very extensive material of rocks and fossils has not 
yet been arranged, I do not intend already to discuss these data 
in details. However, some results which are important for the 
general tectonic structure of the eastern part of the East-Indian 
Archipelago will be shortly indicated here. 
After the geology of the Moluceas had come to be known by 
us as to its principal features by means of the expeditions of 
Martin, WicnMann, Borum, WANNER, a.0., and principally by the 
Moluceas-expedition of VerBrrx, it has been chiefly both the expe- 
ditions on Timor and the surrounding islands conducted by Prof. 
MonENGRAAFF of Delft. and Prof. Wanner of Bonn, that have led 
the way to an exact knowledge of the tectonic structure of the 
eastern part of our archipelago. We may consider it one of the 
chief provisory results of these expeditions that the structure of 
Timor and the adjacent islands was stated to be characterized by 
1) Cf. “Voorloopige reisberichten” in the Tijdschr. v. h. Kon. Ned. Aardr. Gen, 
1915- nos! 4) and 4 SLO als de 
