1893 •] 35 [Upham. 
Courses of Glacial Striak.^ 
Eastern and Central Portions of SomerviUe. 
Crescent Street, mostly S. 30° E., crossed by others from 
S. 15° to 40° E. 
Franklin Place, S. 30° E. 
Between the last and Myrtle Street, nearly horizontal striae on 
a steep rock face, S. 75° E. to N. 85° E. 
Granite Street quarry, on its northwest border, S. 30° E. 
Avon Street, about 25 rods west of School Street, S. 25° E. 
Near the corner of Pearl and Wigglesworth Streets, S. 20° E. 
Several rods northwest from tlie last and about ten rods south- 
east from the corner of Walnut and Veazie Streets, S. 20° E., 
intersected by various courses to S. 55° E. ; but m othei- spots, 5 
to 15 feet southeast from this, only S. 35° E. 
Corner of Pembroke and Sycamore Streets, intersecting striae, 
S. 25° to 50° E. 
Near the corner of Tennyson and Medford Streets, in one 
place, S. 30° E. ; but on another small exposure, twenty feet 
farther north, S. 45° E. 
In Tennyson Street, halfway from Medford to Forster Street, 
S. 25° E. 
Area North of Winter Hill. 
Old (piarry about 200 feet northeast from the corner of Temple 
and Derby Streets, on south border, S. 85° E., with a few inter- 
secting, S. 15° E. 
Northern border of this quarry, intersecting, S. 25° E., 
S. 40° E., and S. 75° E. These are also crossed in some places 
by very line and delicate striae, clearly of glacial origin, bearing 
S. 30° W., which seem to be probably the latest of all, being due 
to a deflection when the ice-front, retreating ]>ast this place, was 
indented by some small hollow, toward which the glacial current 
would be turned from a distance of only a few I'ods. 
'Referred to tlie true or astronomic meridian, from which the magnetic meridian 
has a variation of 11" 30' west of north, according to the iso$;onic chart for 1890 pub- 
lished by tlie U. S. coast and geodetic survey. 
