GEOLOGICAL AND MINERALOGICAL NOTES. 181 



The rocks from which the minerals recorded in the fol- 

 lowinglist were taken represent twenty-nine distinctrock 

 formations, with several thousand outcropping ledges, in 

 all portions of Essex County. The greater number of 

 these ledges have never been broken into except to collect 

 the few specimens required to determine the character of 

 the rock. They will, therefore, without doubt furnish 

 many mineral species new to the county, as they are 

 worked into and studied, and an extremely interesting 

 Held is thus off e red to the niineralogist in the future as it 

 has proved in the past. 



I desire to acknowledge the kind assistance which I 

 have received in determining many of the minerals here 

 enumerated, from Prof. H. Rosenbusch of the University 

 of Heidelburg, Germany ; Prof. S. L. Penfield of the 

 Sheffield Scientific School, New Haven, Conn. ; Prof. J. 

 E. Wolff and Messrs. Charles L. Whittle and T. A. Jag- 

 gar of Harvard College ; Prof. W.O. Crosby of the Bos- 

 ton Society of Natural History ; to Mr. John Robinson 

 of the Peabody Academy of Science for other aid, and to 

 the many friends in all parts of Essex County who have 

 so kindly assisted me in procuring specimens, I especially 

 desire to express my thanks. 



Peabody Academy of Science. 

 Salem, Jidy, 1896. 



CATALOGUE. 



No. 1. Gold. 



The gray copper, galena and quartz, from the Chipman 

 silver mine at Newbury, contains gold, and gold has been 

 reported from various other mines in the neighborhood, 

 and also from Boxford, Topsfield, Lynnfield Centre and 

 Saugus. The analysis of the gray copper from the Chip- 

 man mine made by Prof. R. H. Richards of the Mass. 



ESSEX INST. BULLETIN VOL. XXVI. 21* 



