Vlll 



List of Contributors. 



Wigham, John E. 



An Improved Method of Using Annular Lenses for Light- 

 bouse Illumination (Plates IX. and X.), .... 525 



Wynne, A. B., F.G.S. 



On recent Physical Questions of Geological Interest — being 

 a Presidential Address to |the Royal Geological Society 

 of Ireland, 1889, 290 



DATES OF THE PUBLICATION OP THE SEVERAL PARTS 

 OF VOLUME SIX. 



Part 1. — Containing pages 1 to 38. (February, 1888.) 



, 2. 

 , 3. 

 , 4. 

 , 5. 

 , 6. 

 , 7. 

 , 8. 

 , 9. 

 ,10. 



39 to 110. (May, 1888.) 



Ill to 168. (August, 1888.) 



169 to 262. (November, 1888.) 



263 to 289. (February, 1889.) 



290 to 359, (May, 1889.) 



360 to 374. (August, 1889.) 



375 to 474. (May, 1890.) 



475 to 600. (August, 1890.) 



603 to 626. (December, 1890.) 



