TITLES AND ABSTRACTS OF PAPERS 



i(33 



the blue calcite and mixed \yith the abundant green vesuvianite. Tons of 

 these associations can be collected at the time of their exposure, but the com- 

 pany has paid no attention to the scientific value of the minerals, and conse- 

 quently much instructive material has disappeared completely, since the meta- 

 morphism of the limestone of this quarry shows such a localization that it is 

 seldom that the same association is encountered a second time. 



Metamorphism of the whole mass of limestone and remetamorphism of the 

 northern half of the deposit has taken place, and there appear to have been 

 three general agents of metamorphism. The intrusion of the granodiorite 

 which underlies the limestone hills changed the original beds into marble, 

 and this is seen in the white crystalline marble of the south hill. Following 

 this intrusion came dikes of monzonite and coarse pegmatite, which intruded 

 the deposit in its northern half only and brought about a recrystallization of 

 the marble and formation of such contact minerals as vesuvianite and garnet. 

 These dike intrusions were accompanied or followed by ascending hydro- 

 thermal solutions, and it is due to these solutions that most of the rare or 

 new minerals have been formed. Some of these new minerals are still under 

 investigation. 



Presented bv title. 



EeGISTER of THE BoSTON MEETING, 1919 



Adams, F. D. 

 Anderson, Kobert 

 Ashley, G. H. 

 Barton, G. H. 

 Bassler, E. S. 

 Bateman, a. M. 

 Blackwelder, E. 

 Boutwell, J. M. 

 BowEN, IsT. L. 

 Brooks, A. H. 

 Brown, Chas. W. 

 Burling, L. D. 

 burwash, e. m. 

 Chadwick, G. H. 

 Clarke, J. M. 

 Oleland, H. F. 

 Cobb, Collier 

 Coleman, A. P. 

 Cooke, C. Wythe 

 Crosby, W. 0. 



Cross, Whitman 

 Daly, E. A. 

 Davis, W. M. 

 De Golyer, E. 

 Eakle, Arthur S. 

 Fenner, C. N. 

 Foerste, a. F. 

 Ford, W. E. 

 goldthwait, j. w. 

 Gordon, C. E. 

 Grabau, a. W. 

 Granger, Walter 

 Graton, L. C. 

 Gregory, H. E. 

 Hartnagel, C. a. 

 Hewett, D. F. 

 Htntze, F. F. 



HOBBS, W. H. 

 HOVEY, E. 0. 



Hunt, Walter F. 



