174 GEOLOGICAL NOTES—HONEYMAN. 
Previous to the meeting of the British Association I had the 
pleasure of examining the phenomena of Pleasant Park with the 
other members of the Association. Mr. Blair, of Oakshaw, 
Paisley, and the Rey. Father Kavanagh, 8. J., now of Quebec. 
As the weather at this time was more favourable a more exten- 
sive and minute examination of the locality was effected. The 
“Geology of the Harbour” was pretty fully discussed with 
these Geologists in anticipation of the reading of my Paper 
on this subject, forwarded to the Secretary of the Associa- 
tion, Prof, Bonney. Specimens of rocks and glacially transport- 
ed boulders were collected. One boulder was of a beautiful 
Diorite-Porphyry, from the Cobequid Mountain Archzean series 
of rocks, Of this Father Kavanagh has made an exquisite 
section and forwarded it to me for examination with the Polari- 
scope and Microscope, 
DESCRIPTION, 
The ground mass consists of Hornblende with microscopic 
Plagioclase. The latter is amorphous with minute crystals, 
which are often in twins. Some parts of this mixture is beauti- 
fully pleochroie with the dichroism of the hornblende and the 
trichroism of the feldspar. Other parts are darkened with opa- 
cite which the microscope with direct light shews to be chietly 
magnetite. The Plagioclases separated from the ground mass so 
as to make the rock porphyritic is strikingly pleochroic. There 
are only two rocks which I have previously examined, one from 
Sundy Point, Yarmouth, another from St Peter’s Canal, Cape 
Breton, that exhibit an equal variety of colours, bands and striae. 
Some of these crystals include magnetite. The Feldspar in this 
and the other sections has a different speetrum from that of the 
Labradorite of the Blomidon Basalts and the albite of the Arisaig 
Archean Diorites and the Nictaux and Wentworth igneous 
diorites. I have supposed this form of Plagioclase to be old- 
goclase. 
I have derived much pleasure and profit from this intercourse 
with “ Brother Hammerers,” 
