180 BULLETIN OF THE ESSEX INSTITUTE. 



recorded the discoveiy by Prof. C. U. Shepard, of twelve- 

 sided crystals of columbite and hemitropic crystals of tin 

 ore in the green feldspar rock at Beverly. From exam- 

 inations of the minerals in the green feldspar rock of 

 Beverly, I am inclined to think that the crystals of tin ore 

 may have been titanite or titaniferous magnetite, as this 

 niineral is quite abundant in the rock, — in fact, it is 

 abundant in all of the varieties of the nepheline and elre- 

 olite-zircon-syenite rocks of the region, — and especially 

 as titanite was not found by Professor Shepard in the 

 analysis of the rock. 



In the Essex County Journal of Natural History of 

 1839, Rev. Williarn Prescott communicated a paper on 

 the inineralogy and geology of the southern part of Essex 

 Gounty. In this paper Mr. Prescott enunierates twenty- 

 nine different minerals and gives the localities in which 

 they were found and their mode of occurrence. On Jan- 

 uary 14, 1856 (Proceedings E. I., Vol. i, pp. 151-153), 

 Rev. A. P. Chute read a paper and mentioned cancrinite 

 (this so called cancrinite proved later to be sodalite), py- 

 rite and zircon, collected by Gilbert A. Streeterin Salem. 

 In the proceedings of the Institute (Vol. ii, p. 47), Mr. 

 Ghute gives a list of the minerals of Lynnfield, enumerat* 

 ing fourteen species. This would be agood list from that 

 town at the present time, for a large portion of the bed 

 rock is a Cambrian quartzite, in which there are very few 

 minerals sufficiently conspicuous to be detected without a 

 Compound microscope. 



In the Proceedings of the American Academy (Vol. vi, 

 1863, p. 167), Dr. Charles T. Jackson gives the analyses 

 of the green feldspar, fergusonite and rhodonite, and men- 

 tions the discovery of minute crystals of topaz in the 

 green feldspar by Mr. Francis Alger of Boston : the min- 

 erals were collected at Rockport by the Rev. Stillman 

 Barden of that town. 



