CONTENTS XIII 



Physiology. J. Eoeke : "On the structure ol' the liglit-percepting cells in the spinal cord, 

 on tlie neurolibrilhie in the gtni^lioncells juuI on the innerviition of the striped 

 muscles in Anipiiioxus lanceolatus." 350. 



— K. F. Wenckkbach : "On tlie duration ol'tlie compensatory pause afterstimulation 

 of the auricle of the mammalian heart/' 878. 



— J. K. A. Wertheim Salomonson : "A new law concerning the relation between 

 stimulus and elVect." 3^2. U\. 



Physiology of plants. Tii. Weevers : "Investigations of glucosides in connection with 



the internal mutation of plants." 21)5. 

 PLACE (t.) presents a paper of Dr. J. W. Langelaan : "The principle of entropy 



in physiology." (11). 57. 



— presents a paper of Dr. J. Eoeke : "On the structure of the light-percepting cells 

 in the spinal cord, on the neurotibrillae in the ganglioncells and on the inner- 

 vation of the striped muscles in Amphioxus lanceolatus." 350. 



PLAi'jpoiNTS and corresponding plaits in the neighbourhood of the sides of the »J,surface 



of VAN DEii Waals. Ü5. 

 plane of polarisation (Observations on the magnetic rotation of the) in the interior 



of an absorptionband. 41, 



— (Measurements on the magnetic rotation of the) in li([uefied gases under atmos- 

 pheric pressure. 243. 



— (The calculation — from the magnetic rotation of the) for substance? without 



m 



an absorptionband in the visible spectrum, ilo. 

 PLANES OE position (On the connection of the) of the angles formed by two spaces 



Su passing through a point and incident spacial systems. 53. 

 PLANTS (Investigations of glucosides in connection with the internal mutation of). 2"J5. 

 PONDERABLE BOUTEs (The fundamental equations for electromagnetic phenomena in), 



deduced from the theory of electrons. 251. 

 POPULATION of Central-liorneo (Iniluence of changed conditions of life on the j)hysical 



and psychical development of the). 525. 

 POTENTIAL-DIFFERENCE (On the), which occurs at the surface of contact of two dille- 



rent uon-miscible liquids, in which a dissolved electrolyte has distributed itself. 431. 

 POTTER VAN LOON (j.). Benzidine transformation. 377. 

 PRINCIPLE (The) of entropy in physiology. (U). 57. 

 piiL'NUS (On the prussic acid in the opening buds of). 31. 

 QUANTITY (Reduction of observation equations containing more than one measured). 236. 



— /j (The variability with the density of the) of the equation of state. 4S7. 



RAYS OF HEAT (Oil the emissiou and absorption by metals of) of great wave-lengths. 660. 



REINDERS (w.). Cialvuuic cclls aiul the phase rule. 182. 



KOCK-GL.A.SSES (Ou the refractive index of). 602. 



RÖNTGEN-RAYS (Ditrractioii of). 247. 



R o z E B o o M (h. w. b A k II u I s). See Bakuuis Roozeboom (U. W.). 



