CONTENTS, x 
Physics. J. W. Gray: „The effect of the induction coil in telephonic apparatus”. 
I. 357. IL. 400. 
— J. D. van per Waats: Ternary Systems.” [. 448, IL. 539. III. 681. 
— B, Merrink: „On the measurement of very low temperatures. LV. Comparison 
of the platinum thermometer with the hydrogen thermometer.” 495. 
— J. J. van Laar: „On the asymmetry of the electro-capillary curve”. 560. 
— H. A. Lorentz: „The rotation of the plane of polarization in moving media”. 
669. 
— H. A. Lorentz: vThe intensity of radiation and tbe motion of the earth’’, 678. 
— H. KAMERLINGH Onnes and H. H. Francis HyNDMAN : vIsotherms of diatomic 
gases and their binary mixtures. IL. The determination of density with the 
piezometer of variable volume for low temperatures. 761. [II The isotherms of 
oxygen at 20°0 C. 15°6 U, 0°0 C. 767. IV, The compressibility of hydrogen at 
0°0 C. and 20°0 C. determined by the piezometers with variable volume for low 
temperatures”. 776. 
Physiology. J. W. LANGELAAN : „Further investigations on muscle-tone”. 10. 
— Ts. W. ENGELMANN : /The negative-inotropic influence of the nervus vagus on 
the heart”. 162. 
— C. WINKLER and G. van RIJNBERK: /On function and structure of the trunk- 
dermatoma’’. I. 266. II. 308, III. 509. 
— J. K. A. WerrHEIM SALOMONSON: vA new law concerning the relation of 
stimulus and effect”. I. 341. IL. 381. IIT. 469. 
— C. A. PEKELHARING: „On Pepsin’. 412. 
~— J. Borke: On the development of the entoderm, of Kuprrer’s vesicle, of the 
mesoderm of the head and of the infundibulum in Muraenoids’”. 442. 
— J. K. A. WERTHEIM SALOMONSON : 7On the eflect as a time function’. 647. 
/— J. Boeke: vOn the infundibular region of the brain of Amphioxus lanceo- 
latus”. 695. 
— J. W. LANGELAAN: The principle of entropy in physiology”. 698. 706. 
— H. J. HamBurerr and BE, Hexma: „On the intestinal juice of man”. 733. 
— B. SJOLLEMA: „On the influence of feeding on the composition of the fat of 
milk”, 746. 
PIEZOMETER (The determination of density with the) of variable volume for low tem- 
peratures. 761. 
PIEZOMETERS (The compressibility of hydrogen at 0°0 C. and 20°0 C. determined by. 
the) with variable volume for low temperatures. 776. 
PIEZOMETERTUBES (The calibration of). 35. 
PLACE (f.) presents a paper of Dr. J. W. LANGELAAN: „Further investigations on 
muscle-tone”, 10. 
— presents a paper of Dr. ALEX. Kein: /Bacteriologic researches of human faeces”. 65, 
“ — presents a paper of Dr. J. Borkr: „On the development of the entoderm, of 
Kuprrer’s vesicle, of the mesoderm of the head and of the infundibulum in 
Muraenoids”, 442. 
