XVIII CONTENTS 
Physiology. J. pr HAAN and K. J. FeERINGA: “On the genetic relation 
between lymphocytes and granulated leucocytes.” 962. 
Points (Note on linear homogeneous sets of). 681. 
Poisons (On Adsorption of) by Constituents of the Animal Body. I. The 
adsorbent power of serum and brainsubstance for Cocain. 831. 
— (Experimental Influence on the Sensitivity of various Animals and 
of Surviving Organs to). Part. I. 913. Part. II. 927. 
POLARIZATION and Magnetization Electrons (The Contributions from the) 
to the Electric Current. 850. 
POLONIUM RADIATION (On) and Recovery of Function. 383. 
PRESSURE- and Temperature-coefficients, volume- and heat-effects in 
bivariant systems. 526. 
PRIMIDEALE (Ueber die Zerlegungsgesetze fiir die) eines beliebigen alge- 
braischen Zahlkörpers im Körper der //-ten Einheitswurzeln. 873. 
Prins (H. J.). On the Condensation of Formaldehyde with some Unsa- 
turated Compounds. 51. 
PROTEIN FREE SOLUTIONS (A method for the determination of the ion con- 
centration in ultra filtrates and other). 762. 
PsEUDO-SYMMETRICAL CrysTALs (On the Symmetry of the R6NTGEN- 
patterns Obtained by means of Systems Composed of Crystalline 
Lamellae, and on the Structure of). 815. 
PUNKTMENGEN (Ueber die Struktur der perfekten). Dritte Mitteilung. 471. 
QuaDRATIC involutions among the rays of space. 634. 
Quantities of higher degree (On expansions in series of covariant and 
contravariant) under the linear homogeneous group. 251. 
QUANTUM-CONDITIONS (Note on the circumstance that an electric charge 
moving in accordance with) does not radiate. 145. 
QUARTIC Curve (On a) of Genus Two in which an Infinity of Configurations 
of DESARGUES can be Inscribed. 645. 
Quartics (On an involution among the rays of space, which is determined 
by a bilinear congruence of twisted elliptical). 493. 
Quartz (Measurements on the FizEAu-effect in). The Propagation of Light 
in Moving, Transparent, Solid Substances. Il. 512. 
Rappits (The Genesis of cold-water nystagmus in). Concerning Vestibular 
Eve-reflexes. II. 713. 
RADIATION-THEORY (Urease and the) of enzyme action. III. 29. IV. 126. 
RADIO-ACTIVE ELEMENTS (About the influence of) on the development. 563. 
Rays of space (On an involution among the). 478. 488. 
— (On an involution among the) which is determined by two REYE 
congruences. 482. 
— (On an involution among the) which is determined by a bilinear 
congruence of twisted elliptical quartics. 493. 
