COON ENE Ss; XIII 
LUNAR TIDE (On the semi-diurnal) as deduced from records of the astatic seismograph 
at Batavia. 17. 
MAGNETIC SEPARATION (The) of absorption lines in connection with sun-spot spectra, 
2nd part. 35. 3rd part. 162. 
MAJCEN (GEORGE). On quartic curves of deficiency zero with a rhamphoid cusp 
and a node. 652. 
Mathematics. M. J. van Uven: “Infinitesimal iteration of reciprocal functions”. 21. 
2nd part. 202. 
— Jan ve Vries: “On linear polar groups belonging to a biquadratic plane curve”. 44. 
— Jan pe Vries: “A quadruple involution in the plane and a triple involution 
connected with it”. 82. 
— L. E. J. Brouwer: “On continuous vector distributions on surfaces’. 3rd Com- 
munication. 171. 
— P. H. Scnoute: “On the relation between the vortices of a definite sixdimensional 
polytope and the lines of a cubic surface”. 375. 
— Mrs. A. Boore Storr and P. H. Scuoure: “Reciprocity in connexion with 
semiregular polytopes and nets’. 384. 
— W. KapreyN: “On the final integral occurring in Prof. Winp’s paper: Diffraction 
of a finale pulse wave by a slit, according to KircHHorr’s theory”. 405. 
~ W. van ver Woupe: “Double points of a cs, of genus 0 or 1”. 629, 
— GEORGE MAJCEN: “On quartic curves of deficiency zero with a rhamphoid cusp 
and a node.” 652. 
— W. Kapreyn: “On the integral equation of Fredholm”. 734. 
— H. J. E‚ Berm: “The oscillations about a position of equilibrium where a simple 
linear relation exists between the frequencies of the vibrations”, 3rd part. 742. 
— LrcieN Gopeaux: “On a system of conics in space”. 762. 
— L. E. J. Brouwer: “Continuous one one transformations of surfaces in themselves”. 
3rd Communication. 767. 
— J. C. Kuuyver: “On the integrating of series term-by-term”. 850. 
— J, Worrr: “Quadratic complexes of revolution and congruences of revolution” 
1084, 
— W. KaprEyYN: “On the centra of the integral curves which satisfy differential 
equations of the first order and the first degree”. 1241. 
MATHERIAN early blastocyst (The Eutherian and the). 1077. 
MATHIAS (E.) and H. KAMeRrLINGH Onnes. Rectilinear diameter for oxygen. 939. 
MAXIMUM and minimum pressure (On the appearance of a) with heterogeneous equilibria 
at a constant temperature. 31. 
MELTING DIAGRAM (The) of the system of the three isomeric nitranilines. 429, 
MEMBRANE EXTRACT (On the stimulating effect of chloride of calcium and of intestinal 
mucous) on the action of trypsin. 1002. 
Meteorology. W. van BEMMELEN and C. Braak: “Preliminary report upon the 
investigations of the upper air-layers begun at Batavia in 1909”, 149, 
MICROBES (Lipase produced by). 1200. 
