6@ONTENTS; ix 
Mathematics. Jan pe Vries: vA formula for the volume of the prismoid.” 337. 
— W. Kapreyn: The differential equation of MonaGe”’. 423. 
— J. CARDINAAL: „On the motion of variable systems”. I. 489. II. 588, 
— J. C. Kiuyver: „Series of polynomials”. T. 525. IT. 620. 
— Jan pe Vries: „Right lines on surfaces with multiple right lines”. 577. 
— L. GEGENBAVER: »On integrals containing functions of Bessel”. 584, 
MEASUREMENT of pressure (Accuracy of the) by means of the open manometer of 
KAMERLINGH ONNEs. 23, 
— (On the) of very low temperatures. IV, 495. 
MEASUREMENTS (Further) with potassium ferricyanide. 339. 
MEILINK (B.). On the measurement of very low temperatures. LV. Comparison of the 
platinum thermometer with the hydrogen thermometer. 495. 
MELTING (On the) of binary solid mixtures by cooling. 636. 
MERCURY NITRATES (On the decomposition of) by heating. 657. 
MESOBLAST (On the gastrulation and the formation cf the) in mammals. 161. 
{ MESODERM of the head (On the development of the entoderm, of Kuprrer’s vesicle, 
of the) and of the infundibulum in Muraenoids. 442. 
METHOD (A) for separating crystals from alloys. 758. 
MICHELSON echelon-spectroscope (Some observations on the resolving power ot 
the). 247. 
microbes (Further researches concerning oligonitrophilous). 5. 
Microbiology. M. W. Beryertnck: „Further researches concerning oligonitrophilous 
microbes, 5. 
MICROMANOMETER (Investigations with the). 163. 
Microscopy. J. W. Moun: „An apparatus for focussing the projecting-microscope 
from a distance”. 95. 
MILK (On the influence of feeding on the composition of the fat of). 746. 
MIMULUS LUTEUS (On the irritable stigmas of Torenia Wournieri and) and on means 
to prevent the germination of foreign pollen on the stigma. 184. 
MIXTURES (The densities of) of hydrazine and water. 756. 
— (On the melting of binary solid) by cooling. 636. 
— of ether and chloroform (Vapourtensions of). 156. 
— (Isotherms of diatomic gases and their binary). IL. 761. LIL. 767. IV. 776. 
MOLL (J. W.). An apparatus for focussing the projecting-microscope from a 
distance. 95. 
— On the Hydrosimeter. 245. 
MONG E (The differential equation of). 423. 
MONG E's differential equation (Special cases of). 21. 
MOVING MEDIA (The rotation of the plane of polarization in). 669. 
/MURAENOIDS (On the development of the entoderm, of Kuprrer’s vesicle, of the 
mesoderm of the head and of the infundibulum in). 442. 
MUSCLE TONE (lurther investigations on). 10. 
MIJERS (J.). On the decomposition of mercury nitrates by heating. 657. 
NERVUS VAGUS (Lhe negative-inotropic influence of the) on the heart. 162, 
NITRAMINES (4 new class of) 88, 
