120 REPORT ON THE GEOLOGY OF ESSEX CO., MASS. 



dence obtained by microscopic and microchemical analy- 

 ses ; and this, often, in cases where the rock at first ap- 

 peared to be of some familiär sort and its determination 

 once completed satisfactorily. 



While mapping the bed rock it was found that notes 

 upon the drainage and watershed of the county could be 

 made at the same time and thus prepare material for a 

 second map. This work is now nearly com[)leted. Work 

 on the glacial phenomena in the county, represented by 

 the drumlins, moraines, stratified and unstratified drift, 

 kames, eskers, smoothed, striated and grooved surfaces 

 on thevarious outcropping rocks, has been in progress and 

 the material for a third map is thus well under way. 



At the end of each year a report of progress has been 

 made to the Trustees of the Peabody Academy of Science, 

 while during the same time several papers have been pre- 

 pared which have been accepted and published by the 

 Essex Institute. They are as follows : 



Geologiealand Mineralogical Notes : No. 1. On Soda- 

 lite from Salem Neck and Vicinity (Bulletin Essex In- 

 stitute, Vol. xxi, 1S89). 



Geological and Mineralogical Notes: No. 2. The 

 Stratified Rocks of Essex County (Bulletin Essex In- 

 stitute, Yol. xxii, 1890). 



Geologiealand Mineralogical Notes : No. 3. The El- 

 seolite-Zircon-Syenites and Associated Rocks of Essex 

 County (Bulletin Essex Institute, Vol. xxm, 1891). 



Geological and Mineralogical Notes : No. 4. The Ex- 

 tent and Probable Thickness of the Crystalline Cambrian 

 Deposits in Essex County (Bulletin Essex Institute, Vol. 

 xxm, 1891). 



Geological and Mineralogical Notes : No. 5. Augite- 

 Syenite, Vom Rath (Bulletin Essex Institute, Vol. 

 xxiv, 1892). 



