CONTENTS IX 



Helium (Further experiments with liquid). T. Magnetic researches. XXIII. 



On the magnetisation of gadolinium sulphate at temperatures obtainable 



witii liquid helium. 626. 

 Heptanchus ciNEREUS (Thvmus, spiracular sense organ and fenestra vestibuli 



(ovalis) in a 63 m. m. long embryo of). 727. 

 Herf. LLE (F. d.'). Culture du bacteriophage sans intervention de bactéries 



vivantes. 486. 

 Hermans (P. H.). Provisional communication on boric acid compounds 



of some organic substances containing more than one hydroxyl-group. 



Boron as a pentavalent element. 32. 

 Hertzsprung (E.). On the magnitude equation of Osthoff's estimates 



of star-coulours. 12. 

 Hevea late.x (The coagulation of). 675. 

 Histology. M. W. Woerdeman : "On the determination of polarity in the 



epidermal ciliated cell (after experiments on amphibian larvae)". 702. 



— M. W. Woerdeman: "A contribution to the histophysiology of the 

 ciliated epithelium". 707. 



— E. WiNKLER-JuNius and J. A. Latumeten ; "The histopathology of 

 Lyssa in respect to the propagation of the lyssavirus". 825. 



Hoeve (J. van der) and H. J. Flieringa. Determination of the power 

 of the accommodation-muscle. 763. 



Hunger (F. W. T.). On the nature and origin of the cocos-pearl. 357. 



Hunter (John I.). The forebrain of apteryx Australis. 807. 



Hydrodynamics. J. M. Burgers: "On the resistance experienced by a 

 fluid in turbulent motion '. 582. 



Hydrogen (On the determination of the magnetisation at very low tempe- 

 ratures and on the susceptibility of gadolinium sulphate in the region 

 of temperatures obtainable with liquid). 613. 



Hydrogenation of paraffin by the Bergius' method. 226. 



Hydroxyl-group (Provisional communication on boric acid compounds of 

 some organic substances containing more than one). Boron as a penta- 

 valent element. 32. 



Hyperboloid (A representation of the line elements of a plane on the 

 tangents of a). 129. 



Indium (Measurements concerning the electric resistance of) in the temperature 

 field of liquid helium. 504. 



Infralateral arc (A non-tangent). 712. 



Insectes (Sur quelques nouveaux) des lignites oligocènes (Aquitanien) de 

 Rott. Siebengebirge (Rhénanie). 605. 



Integral equations (An application of the theory of) on the determination 

 of the elastic curve of a beam, elastically supported on its whole 

 length. 237. 247. 



