CONTENTS XXVII 
Physics. N. H. KoLKMEYER: “Space-time symmetry. I. General considerations.” 
1419. Il. Discussion of a special case. The tetrahedrical atom-models 
of LANDÉ. 1428. III. Remarks on the deduction of groups of space-time 
symmetry-operations. 1434. 
Physiology. J. BRAMSON: “Experimental proof for the active dilatation of 
cross-striated muscle-tissue.” 111. 
— Jj. J. VAN LOGHEM: “Identity of the blood-digestive and gelatine- 
liquefying bacterial actions.” 115. 
— S. pe Boer: “On fibrillation of the heart.” I. 319. II. “On the rela- 
tion between fibrillation of the heart and “Gehäufte” extra-systoles.” 
329. III. “Ventricular fibrillation and “Gehäufte” extrasystoles of the 
ventricle excited by the “Erregung’ consequent on an artificial auri- 
cular systole.” 533. 
— Lucire W. Scuut: “Factors which are of importance for the habit- 
formation of birds. I. Visual sensations.” 338. 
— R. Macnus and U. G. BijrsMaA: “On the pharmacological action of 
isoamyl hydrocuprein (eukuprin) and isoctyl hydrocuprein (vuzin).” 481. 
— W. STORM VAN LEEUWEN and J. ZEYDNER: “On adsorption of poisons 
by constituents of the animal body. II. The adsorbent power of rabbit's 
serum for atropin.” 486. 
— A. DE KLEYN: “On the effect of tonic labyrinthine and cervical 
reflexes upon the eye-muscles.” 509. 
— S. pre Boer: “On the artificial extrapause of the ventricle of the 
frog’s heart.” 542. 
— S. pe Boer: “On artificial and spontaneous changes of rhythm in the 
bled frog’s heart.” 552. 
— W. STORM VAN LEEUWEN and Miss C. VAN DEN BROEKE: “A quantitative 
inquiry into the antogonism pilocarpin-atropin on the surviving cat-gut.” 628. 
— H. ZwAARDEMAKER: “On the adsorption of odorous molecules to the 
surface of solids.” 654. 
— H. ZWAARDEMAKER and H. ZEEHUISEN: “On Spray-electricity of 
solutions of electrolytes.” 658. 
— W. EINTHOVEN: “On the observation and representation of thin 
threads.” 705. 
— A. A. HIJMANS VAN DEN BERGH and P. MULLER: “On serum-lipo- 
chrome.” II. 766. 
— H. ZWAARDEMAKER: “On sensibilization to radioactivity by the action 
of hormones.” 838. 
— R. Maanus and A. DE KreEyN: “The function of the otolithes.” 907. 
— K. LANDSTEINER: “On the serological specificity of haemoglobin in 
different species of animals.” 1161. 
