57 
Manchester, Nov. 1 4, 1877. 
Large Boulder in Seymour Grove. 
Dear Sir, 
I find that we did take out the full depth of the stone, 
which was something like three feet below our ]evel. The 
easterly side was also taken off, leaving the bulk of the 
stone left in on the western side and the roof of the tunnel. 
The length blasted through horizontally was about ten 
feet, and the hole driven through it 4ft. Gin. X 3ft. Gin. 
The section is something like the following : — 
To Mr. E. W. Binney. 
Explanation. 
A — Excavation through the stone for the sewer. 
B — Side of the stone cut away. 
C — Level of the excavation. 
D — The bulk of the stone left in the westerly side and roof of 
the tunnel, as shown by the jagged line. 
The deposit of till in which the stone was found is about 
twenty feet in thickness, and rests on the pebble beds of 
the Trias. It is free from many small stones, but a few 
boulders of moderate size have been met with in making the 
sewer. The height of the spot where the stone was found 
is ninety feet above the sea level, the direction of the sewer 
magnetic north and south, and the longitudinal axis of the 
