8 BULLETIN OF THE BUSSEY INSTITUTION. 
Samples taken from two different quarries, close to Pigeon 
Cove, Cape Ann. These samples were rich in feldspar 
and they were somewhat weathered . . . . . . 5.241 0.046 
Chip taken from Boston Post-office building, said $5 come | 
from quarries at west side of Gloucester, Mass. . . . 1.781 0.042 
Chip taken from a stone-cutter’s yard, said to have come ; 
from Quincy, Mass... 2. +) +.{6 us ¢6 (er 
SLATES. 
Dark micaceous schist from the granite quarry in Dracut, 
mentioned above .. . - 4.856 0.287 
Finely ground and bolted Av tok Saco, Rear. pre- 
pared and sold as a ‘‘fertilizer’’ by the Old Orchard 
Slate Co., of Portland, Maine .... . . 4.180—4.873 0.089 
Compact, blue clay-slate from ‘‘ City j.edge,’’ * Somer- 
ville, Mass., half a mile or more west of the Milk Row 
Guarry) 3% - « « « 8.875—3.913 0.085 
Hard, blokeaeraitrent bene uate rock, secrete an 
indurated sandstone passing into micaceous schist ; from 
Dracut bank of the river opposite head of Merriiaek 
Street, in Lowell . . . . . 2.956 0.145 
Similar to the preceding, from edie’ near “Towel gas 
WWOYER 2.4/4 soem . 2.468 0.296 
Similar to the ses fis on el of Mancirnwek Rye at 
Lowell, below the falls . . . . . 1.635 0.136 
Similar to preceding, from a ledge on bank of old otha. 
some 800 feet from the a where it leaves the Merri- 
mack River £273.55 . 1.483 0.148 
Rhomboidal clay slate ffbin | quarry near ola powder 
house, Elm Street, Somerville, Mass. . . . . 1.294 0.098 
Soft clay shale, from Morton Street, Jamaica Plaiti} near 
junction with Walnut Street . . . . . 1.099 0.140 
Compact dark-colored rock Sites sanidatottel from 
Morton Street, as above . . . . 1.063 0.087 
Soft clay shale from Everett, Mass., on borders of: Chelaeas! 
near corner of Chelsea Street ee Everett Avenue ., . 0.908 —— 
SOAPSTONE. 
From quarry of the Union stone Co., Groton, Mass. . . 0.370 0.162 
TRAPS. 
(Slightly decomposed in most instances, from exposure to the weather.) 
Compact, light-gray, fine-grained, speckled rock from a 
dyke in ledge at Andrews Point, Pigeon Cove, Mass. 
* The Saco slate contained 0.676% of lime (CaO); and the City Ledge 
Slate, from Somerville, 1.816% of lime. 
