4.0 J. D. Marsuat on the Statistics and 
discerned. The specimen of fossil coal was similar to that found at the Giant’s Cause- 
way and elsewhere. 
When strolling along the base of the white cliffs in Church bay, I was frequently 
struck with the appearance of nodules of dark flint which occurred amid the substance 
of the limestone, and which have been before noticed by Dr. Hamilton. When 
broken, they were of a dark grey colour, and imperfect transparency. 
Zeolite and calcareous spar I found in great abundance in detached pieces in dif- 
ferent parts of the island, but more particularly on the southern side of Church bay, 
where the basalt is strewn about in fragments of every shape and size. On breaking 
some of these, beautiful crystals of quartz and zeolite appeared in the cells and 
cavities. 
A mineral somewhat resembling the puozzolana of Italy has been frequently found 
along the shores of Raghery. As described by Dr. Hamilton, it is “ very cellular, 
sharp and cutting in its feel, of a specific gravity little superior to that of water, and 
of the character of a basaltic cinder broken down.” ‘The specimens which I pro- 
cured were not exactly analogous in appearance to that just mentioned ; but as it is 
said to exist in the state of a gritty powder before its contact with water, and those 
pieces which I obtained had, I should think, been submitted to the action of that fluid, 
it is scarcely correct to institute a comparison. 
Mr. Gage mentioned to me, that specimens of this puozzolana had been forwarded 
for experiment, and that it was supposed that it might be serviceable for the same 
important purposes as those volcanic products found at Naples and in the Canary 
Islands. 
In the island of Rathlin there are several systems of basaltic pillars. At Kenramer, 
or the western extremity, many may be observed, the pillars standing in a vertical 
position, although none of them are very regular. At one of these headlands, called 
Croch-an-Teriy, 1 noticed a peculiar arrangement, which I do not believe has been 
mentioned by any writer on Rathlin. The pillars were arranged like the spokes of a 
wheel, each running out from a common centre. The headland is between three and 
four hundred feet high, and the columns near its summit, against the face of the cliff, 
being in some places fractured and interspersed with grass, present an aspect more 
interesting than if they had been arranged in unbroken regularity. 
At Thivigh, or the side point, there is a headland which slopes down into the sea and 
is covered with grass; but the section, sideways, exhibits two assemblages of square 
pillars not unlike those of Fairhead. 
Near Ushet, on the south-east side of a hill, named in Irish Broagh-mor-na- 
Hoosid, there is an elegant causeway, which runs to the extent of between four and 
five hundred yards. ‘he pillars are pentagonal and hexagonal, a few only having 
seven sides. 
