132 REPORT ON THE GEOLOGY OE ESSEX CO., MASS. 



debtedness to Mr. John Robinson, of the Peabody Acad- 

 emy of Science, for his kind assistance and encouragement 

 throughout the work, to the Essex Institute for the gen- 

 erous manner in which niy papers and map have been 

 published, and especially to Mr. T. F. Hunt of the Insti- 

 tute's publication committee, and also to Mr. David Pin- 

 gree for his gift of the petrographical microscope. I feel 

 under great obligations to Dr. J. E. Wolff, instructor in 

 the Petrographical Laboratory at Harvard and to Prof. 

 N. S. Shaler, for their very kind assistance and advice ; 

 and I desire to dedicate this map to the Lawrence Scien- 

 tific School in acknowledgment of this kindness and the 

 friendships formed there while one of its students. 



LIST OF PUBLICATIONS. 



NOTES ON THE MINERALOGY AND GEOLOGY OF ESSEX 

 COUNTY, MASS. 



Proceedings of the American Academy. 



Vol. ii, p. 270. Mansfield Coal Formation at Nahant. 

 * Prof. L. Agassiz. 



Vol. iv, p. 353. Granite as a Building Material. 



Chief Justice Shaw. 

 Vol. vi, p. 167. Minerals from Rockport. 



CT. Jackson. 



Boston Journal of Philosophy and Arts. 



Vol. i, p. 390. Green Feldspar from Beverly. 



J. W. Webster. 

 Vol. i, p. 599. Green Feldspar and Zircon from Bev- 

 erly. J. W. Webster. 

 Vol. iii, p. 486. Remarks on the Geology of Boston 

 and vicinity, continued. 



J. W. Webster. 



