INDEX 



211 



Van Iterson, 148, 183 



Van Iterson and Meeuse, 203 



Vessels, 17, 18, 114,143 



major extinction position, 119, 144 



spiral pits, 143 

 Viscosity, 78 



specific, 79 

 Vogl, 7 

 Volten, 8 

 von Mohl, 5, 6, 7 



Wardrop, 129, 205 



Wigand, 6 



Wolff, 5 



Wood, chemical composition, 23 



X-radiation: 



diffraction at lattice points, 37 et seq. 

 effect of number of points, 47 



diffraction from small specimens, 51 

 X-ray diagrams: 



fibre, 121 et seq. 



fusion of arcs, 126, 127 



interpretation by pole figure, 121 etseq. 



of model spirals, 127 



rotation, 121 

 Xylan, 27, 85 



Zacharias, 7 

 Ziegenspeck, 172 

 Zimmerman, 7 



