I. GEOLOGY. 697 



3253e. Coloured Diagrams enlarged from small water- 

 colour drawings, 1J inches in diameter, made direct from the 

 microscope by the contributor. J. Clifton Ward. 



A. Cumberland Volcanic Rocks (see also Plate A of small water-colour 

 drawings contributed). 



1. Lava, Brown Knotts, Keswick. 



2. Lava, Wastwater. (Polarized light.) 



3. Felsite, amid altered ash, Bleaberry Fell, Keswick. 



4. Ash, Steel Fell. (Polarized light.) 



5. Altered streaky ash, Base Brown. 



6. (Polarized light.) 



7. Altered ash, Hart Side. 



8. Highly altered fine bedded ash, Great Gable. 



B. Welsh Volcanic Rocks. 



9. Felstone, a metamorphosed ash, Kigghause End, Vale of St. John, 



Cumberland. (Polarized light.) 



10. Felstone, Aran Mowddwy. Also represents the structure of Fig. 9. 

 when viewed with plain light. 



11. Felstone, Aran Mowddwy. (Polarized light.) 



12. Felstone, Aran Benlynn. 



13. Felstone, Llanberis Koute, Snowdon. 



14. Slaggy felstone or altered streaky ash, Llanberis Route, Snowdon. 

 NOTE. The Welsh felstone probably represents the modern trachytes or 



quartz-trachytes, and the Cumberland lavas the modern trachy-dolerites and 

 basalts. 



3253f. Three Plates of small water-colour drawings, 

 lj inches in diameter, made direct from the microscope by the 

 contributor, illustrating Microscopic Bock-structure. 



J. Clifton Ward. 



A. Modern Volcanic Rocks. 



1. Trachyte, Solfatara, x 40. 



2. (Polarized light), x 15. 



3. Leucitic lava of 1631, Vesuvius, x 15. 



4. Alban Mount, Rome, x 14. 



(Polarizedlight). 

 6. Lava of 1794, Vesuvius, x 6. 

 7- x45. 



Ancient Cumberland Volcanic Rock. 



8. Lava, Eycott Hill, x 25. 



9. Brown Knotts, Keswick, x 30. 



10. near Wastwater. (Polarized light), x 15. 



11. Felsite, amid altered ash, Bleaberry Fell, Keswick, x 60. 



12. Ash, Steel Fell. (Polarized light), x 15. 



13. Altered streaky ash, Base Brown, x 15. 



14. Altered ash, Hart Side, x 20. 



