EXPLANATION OV PLATE 11. 



Beiyl, Torringtoii, N.S.Wales. 



Fig. 1. Crystal xv. ; tins crystal, the terniiuatiou of which is directed 

 downwards, shows signs of prolonged etching, the prism 

 faces being deeply fluted and the base reduced to a number 

 of isolated pinnacles. 



„ 2. Cx'ystal xiii.; showing zonal growth. — about ^ 



,, 3. Base etched with caustic soda. 



,, 4. Crystal xii.; natuial etch tigures on the base. The figures are 

 hexagonal depressions disposed in an approximately' linear 



manner abmit ^ 



„ 5. Etch figure on base of crystal xii. enlajged. 



„ 6. Crystal ix.; the base of this crystal is intei-sected by "gullies" 

 separating elevations of hexagonal foini. — about J 



7. Crystal viii.; base with numerous hexagonal elevations and 



3 

 2 



markings and linear depiessions. — about 



