CONTENTS. xr 
LuJAURITES (On the primary parallel structure in). 734. 
MAGNESIUM (Potassium sulfur and) in the metabolism of Aspergillus niger. 1349. 
MAGNETIC FIELD (On the Harr-eftect and the resistance in the) at low temperatures. 
Ts SO7xIh 319. ELL 649. TV: 669. V. 664, VE: ISL. VEL 968°. VEELS 997. 
MAGNETIC RESEARCHES. On paramagnetism at low temperatures. VI. 322. VII. 965. 
VIIL On the susceptibility of gaseous oxygen at low temperatures. 1404, 
MAGNETISATION (The effect of temperature and transverse) on the resistance of 
graphite. 148. 
MALIGNANT GRANULOMA (On a micro-organism grown in two cases of uncompli- 
cated). 765. 
MAN (Contributions to the knowledge of the development of the vertebral column of), 80. 
— (On the occurrence cf a monkey-slit in). 1040. 
MANEGE MOVEMENT (The posterior longitudinal fascicle and the). 727. 
MANGANE SULPHATE (The system sodium sulphate), and water at 35°. 1326. 
MANGANESE (Action of hydrogenious boric acid, copper), zinc and rubidium on the 
metabolism of Aspergillus niger. 753. 
MARTIN (PIERRE). The magneto-optic Kerr-eftect in ferro-magnetic compounds 
and metals, III. 138. 
Mathematics. M. J. van Uven: “Homogeneous linear differential equations of order 
two with given relation between two particular integrals”. 5th Communication. 2. 
— J. C. Kuvyver: “On a differential equation of ScuLiriy’. 27. 
— W. Kapreyn: “New researches upon the centra of the integrals which satisfy 
differential equations of the first order and the first degree”. 2nd part. 46. 
— G. pe Vries: “Calculus rationum”. 2nd part. 64. 
— L. E. J. Brouwer: “On iooping coefficients”. 113. 
— E. L. Exte: “The scale of regularity of polytopes”. 200. 
— L. E. J. Brouwer: “Continuous one-one transformations of surfaces in them- 
selves”. 5th Communication. 352. 
— Hk. pe Vries: “On loci, congruences and focal systems deduced from a twisted 
cubic and a twisted biquadratic curve”. I. 495. IL, 712. III. 890. 
— Jan ve Vries: “On metric properties of biquadratic twisted curves”. 910. 
— Jan DE Vries: ‘On the correspondence of the pairs of points separated har- 
monically by a twisted quartic curve”, 918. 
— Jan DE Vries: “On a line complex determined by two twisted cubics’’. 922. 
— W. van DER Woupe: “On Steinerian points in connection with systems of nine 
g-points of plane curves of order 3p”. 938. 
— Jan DE Vries: “On bilinear null-systems”. 1156. 
— Jan pe Vries: ‘On plane linear null-systems”. 1165. 
— W. Kaprreyn: “Expansion of a function in series of ABEL’s functions ¢(n(x)”. 1245. 
— L. E. J. Brouwer: “Some remarks on the coherence type »’. 1256. 
— Jan De Vries: “An involution of associated points”. 1263. 
— W. A. Versruys. “On a class of surfaces with algebraic asymptotic curves”. 1368. 
MATHIAS (B), H. KAMERLING ONNEs and C. A. CROMMELIN. On the rectilinear 
diameter for argon. 667. 960, 
