IN ESSEX COUNTY, MASS. 139 



the conditions of his work than has Mr. Wright. His 

 removal from the county is deeply to be regretted. 



Following the meeting of the American Association 

 for the Advancement of Science in Salem in 1869, a 

 number of its members made a visit to Rockport, mider 

 the auspices of the Institute. Col. J. W. Foster, the 

 eminent archreologist of Illinois, and Professor T. Sterry 

 Hunt, made interesting and valuable addresses at the meet- 

 incr there o^athered. 



The work I have mentioned has been largely done in a 

 desultory way, and by untrained local students. Prof. 

 Alpheus Hyatt and others had given some attention to 

 our local geology, and in May, 1871, Professor Hyatt 

 read a paper before the Institute on this subject. 



This marked the beginning of a thorough detailed study 

 of the district. Prof. Edward Hitchcock, in his report 

 and map of 1841, and Prof. C. H. Hitchcock, in his map 

 of 1871, had drawn the substantial geological features of 

 the county; but as scientific views change rapidly and 

 often radically, Professor Hyatt, in his more minute and 

 recent investigations, fomid reasons for differing from 

 their conclusions. He made a detailed map in colors of 

 the geology of Marblehead Neck, which is now in the 

 Mass. Institute of Technology. 



Mr. M. E. Wadsworth, of the Boston Society of Nat- 

 ural History, and Prof. T. Sterry Hunt (see his "Chemical 

 and Geological Essays") deserve mention for valuable, 

 original work on the geology of this region. 



Professor Hyatt's work has been taken up, and under 

 his direction carried to greater completeness by Mr. W. 

 O. Crosby, by whom a map and report were prepared 

 under the patronage of the Mass. Commission to the Cen- 

 tennial Exhibition in 1876. In this report we have the 

 first detailed and comprehensive statement of the geology 



