Explanation of Plate V. 



Pili;. 1. Quartzose wolframite-cassiterite ore from the Daiseu vein. 1/2 natural 

 size. Q, quartz ; ic, thin plate of wolframite. Cassiterite is enclosed in 

 quartz as microscopic crystals and gi'ains. 



Fig. 2. King-ore from the Daisen vein. Natural size. R, silicified or partial- 

 ly sideritized rock-fragment ; Q, quartz crust ; T, layer rich in cassiterite ; 

 C, chalcedony crust. Note a sti'eaky cassiterite zone in the second quartz 

 crust. 



Pig. 8. Another large piece of ring-ore from the Daisen vein. 1/4 natural 

 size. 11 = ore-ring. 



