Kev. Dr Fleming’s Gleanings Natural History. • lOl 
stone abounds in these spaces, and in numerous veins with which 
the rock is traversed. On the south side of Campbeltown Bay, 
tbe same series of slaty rocks occurs, with the addition of a thick 
bed of reddish compact felspar-porphyry. The most interesting 
beds in the whole of this series are the Limestones. These are 
of two kinds ; both, however, granularly foliated, (and, as far as 
was observed) -destitute of organic remains. The first is com- 
mon, small granular limestone, of a reddish colour, in the form 
of thin beds in the sandstone. The second constitutes the mine- 
ral termed Foliated or Sparry Lucullite. It is of a velvet black 
colour, and appears in the form of angulo-granular portions, from 
a quarter to half an inch in size. These may be regarded as im- 
perfect rhomboid al crystals. They are closely united by white, 
fine granular limestone. The stone is extensively quarried and 
burnt for lime, on the north side of the bay. The strata are some- 
what irregular. The surfaces of each present protuberances in- 
dicative of the concretions ; or, in consequence of the cement- 
ing matter being raised, a singularly reticulated aspect is exhi- 
bited. The fracture of the concretion is usually slightly curved 
foliated ; but, in some cases, the fracture is straight foliated, and 
the angles of the rhomb have the same value as calcareous spar. 
The black colour of the concretions arises from the intimate 
mixture of charcoal. This is easily manifested in their solution 
in acids, by the black powder which remains. By what power, 
it may be asked, has the charcoal been separated from the ce- 
ment, and incorporated exclusively in the concretions The 
charcoal seems mechanically mixed ; and hence probably gives 
the curvature to the planes of the spar, in the concretions. The 
dark colour and foliated fracture of the concretions, contrasted 
with the white colour and fine granular fracture of the connect- 
ing matter, render this rock, in hand specimens, one of the most 
Beautiful minerals of which Scotland can boast. 
On the morning of the 30th, I took leave of my kind and 
attentive friend, and embarked on board the Britannia steam- 
packet for Glasgow. 
