240 j Additional Remarks on the 
In Transition Limestone. 
Rock crystals. ; In some of the ploughed fields these 
Quartz crystal. § crystals have been abundant. Dr. 
Swift has one crystal, a flat six sided prism very much 
compressed, in length half an inch, three eights of an inch 
in width, and one line in thickness; this crystal has eight- 
een facets: also prisms with a terminal pyramid at each 
end. 
Calcareous Spar, in hexaedral prisms. 
Pearl Spar, in rhombs. 
Brown Spar. . 
Agaric mineral and Fossil Farina occur abundantly in 
all the fissures of the limestone. 
Veined Marble. A stratum has been found four miles 
north west from Easton, but the quantity is not yet ascer- 
tained. 
Hernstone, of various colors, generally black. 
In the Diluvial Formation. 
Jasper, Chalcedony, Lydian Stone, Hyalite, &c. 
No. 126, Broadway, New-York. 
Art. Vl.—Additional remarks on the Geology of a part of 
Massachusetts, &c. (See Vol. VIII. No. i.) By Prof. 
Cuester Dewey. 
Since the publication of the Geology of this section, I 
have made additional observations upon the southern part, 
and still farther south and west in the states of Connec- 
ticut and New-York. These observations will extend 
our knowledge of the geology of the country above the 
highlands and east of the Hudson, and continue the sec- 
tion in the state of New-York considerably farther to the 
south, 
The alternations of mica-slate and granular limestone, 
mentioned Vol. VIII. p. 15. are more numerous than | 
had before noticed. In passing across the direction of the 
strata in Sheffield, and in Salisbury, Conn., | observed the 
