217 
of EdinhurgJi, Session 1882-83. 
granite are more frequent further west in tlie Ehinn district. 
Quartz and quartzite pebbles are not uncommon. Many of those 
on the sand bills have been used as hammer stones. There are 
pebbles of various porphyries and other rocks which would repay 
examination by trained geologists. I believe some of the materials 
of our drift have come from Arran. Flint is plentiful in situ in 
Armagh. At Glenluce the drift is not found very far from the sea. 
The sections at higher levels show much boulder clay. As yet I 
have seen no flint in the boulder clay. 
YU.— NOTES BY REV. PROFESSOR DUNS ON BOULDERS IN THE 
ISLAND OF MULL. 
The Convener having learnt that Professor Duns, one of the 
Committee, had resided during a portion of last summer in Mull, 
wrote to ask him whether he had taken note of any boulders. 
The following is extracted from Professor Duns’ answer, dated 
27th April : — 
“ I spent two months in Mull last year, limiting my wanderings 
to the northern part of the island. 
“ Perhaps the best answer to your kind note is to copy from my 
diary the only notes I made on boulders. 
“June 3, 1882, Tobermory. — Walked to Mislinish first lake. 
Struck into the hills at the burn on the north. A boulder of coarse 
reddish granite, on the pretty steep slope of the east bank. This is 
the first ^ heathen^ I have seen. None were met with on the moor 
across which I passed yesterday, lying between the new road to 
Sorn and the Sound of Mull. 
“June 7th. — Yesterday’s drive from Tobermory to Torloisk^ and 
to-day’s ramble among the hills between the Sorn road and the 
Sound, and chiefly those lying above the Runa-Gcd lighthouse, cor- 
rect my note under 3rd current. Both on each side of the road to 
Torloisk and among these hills, granite boulders are numerous, but 
few are large. They range in size from that of a ‘ fist ’ to twice 
that of the ‘ head.’ A few well sunk in the soil show a surface 2 
to 3 feet broad. The granite is for the most part a coarse reddish 
one. But there are some fine grained ^ greys.^ The largest met 
with is gneiss. A small quartzite specimen occurs in the same area. 
