TITLES OF PAPERS 83 



Following this, the paper entitled 



BLEACHING OF GRANITE AT LIMESTONE CONTACTti 

 BY H. P. GUSHING 



was presented extemporarily, illustrated with specimens; 15 minutes. 

 Then the joint paper 



PEGMATITE IN THE GRANITE OF QVINCY. MASSACHUSETTS 

 BY C. H. WARREN AND C. PALACHE 



was divided into two parts, the discussion of the petrography being read 

 from manuscript by Professor Warren, while the mineralogical portion 

 was presented extemporaneously by Professor Palache, using a large 

 series of specimens as illustrations. Eemarks were made by J. F. Kemp. 



BARITE DEPOSITS OF FIVE ISLANDS, NOVA SCOTIA 

 BY CHARLES H. WARREN 



was presented by title. 



FAYALITE IN THE GRANITE OF ROCKPORT, MASSACHUSETTS 

 BY CHARLES PALACHE 



was given without manuscript, and consisted of an exhibition of speci- 

 mens with a description of their mode of occurrence ; 10 minutes. 



NEL80NITE: A NEW ROCK TYPE, ITS OCCURRENCE, ASSOCIATION, AND 



COMPOSITION 



BY T. L. WATSON AND S. TABER 



was read by title in the absence of the authors. 



MICROSCOPIC STUDY OF CERTAIN COALS IN RELATION TO THE SAPROPELIC 



HYPOTHESIS 



BY E. C. JEFFREY^' 



was presented extemporaneously with numerous lantern slide illustra- 

 tions, 30 minutes. Eemarks on the paper were made by David White. 



REGIONAL DEVOLATILIZATION OF COAL 

 BY DAVID WHITE 



was given without manuscript, 15 minutes, and was discussed by J. F. 

 Kemp. 



i« Introduced by David White. 



Ill — Bull. Geol. Soc. Am., Vol. 21, 1909 



