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REPORTS ON EXCURSIONS. 111 
Littte Cumpraz, 17th June, 1893.—This excursion was 
arranged jointly with the Geological Society of Glasgow. Some 
of the party left town in the morning, and travelled wid Fairlie 
and Millport ; but the majority found it more convenient to leave 
in the afternoon, crossing from Millport to Little Cumbrae in 
rowing-boats, and landing near the castle. Those who formed the 
second party had scarcely sufficient time at their disposal for 
exploring the island; but a number of plants were gathered, of 
which the following have been noted :—Glaucium flavum, Crantz., 
Corydalis claviculata, DC., Sagina apetala, Linn., Radiola linoides, 
Gmel., Geranium sanguineum, Jinn., Agrimonia Lupatoria, 
Linn., Sedum anglicum, Huds., Eupatorium Cannabinum, Linn., 
Samolus Valerandi, Linn., Solanwm Dulcamara, Linn., Lycopus 
europeus, Linn., Scwtellaria galericulata, Linn., Aspleniwm 
marinum, Linn. if 
On the cliffs, near the south end of the island, a nest of the 
peregrine falcon, containing two young birds, was observed by 
Mr. James Steel. 
_ There are only two rock-masses on the Little Cumbrae, viz., 
Trap and Sandstone. On the east shore, south of the castle, the 
sandstone is found outcropping under a thin bed of ash. This 
separates it from the overlying trap, which has indurated it very 
much ; and it is found to be penetrated by numerous thin joints, 
which glitter in the sunshine. If continued, it would pass over 
_ the trap on which the éastle is built ; but as the sandstone is never 
found above the trap on the opposite shore at Fairlie and Portin- 
cross, a hitch has probably occurred. This hitch is not visible, as 
the spot where it occurs is covered with gravel or water. The 
_ trap is bedded, marking successive flows of lava, and dips to the 
_ north-east in the same direction as the sandstone. It is rudely 
_ columnar, and in many places very amygdaloidal ; the cavities are 
_ sometimes empty, and occasionally lengthened out, or with a few 
_erystals, but oftener filled with calcite (which is the prevailing 
mineral), showing that the trap contains much lime. In the 
cavities there are also deposits of quartz, which is often beautifully 
white, and is sometimes banded ; it is frequently hollow in the 
centre, and bristling with quartz crystals. The quartz also {fills 
cracks in the trap. At Gull Point, the southern extremity of the 
x . A . *; . 
‘island, the rather scarce mineral Heulandite is common, and occurs 
