Fiq.19. 



OXYD OF T IN» 



First Modification . 



Fiq. 20. 



Ira/ututionj or the (^cotogical Society Vol. 2, PLATE 26. 

 Fief. 21. 



f 



Fiff.22. 



Second Modification 



Fi<j.?3. 



Fi^.24. 



Fiq.25. 



t. , 



/"W. 29. 



Flff.26. 



Fig.ZO. 



Fi^.2T. 



Fief. 31 . 



Fe^.26. 



Frg.32. 



Third Modification. 



Fig. 33. 



Uipi del . 



Puhluhtd by miii^m Phillips London idii. 



Wilson Lov/ry sculp. 



