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May we suppose that olivine, in undergoing the remarkable change described at St. Behind Hobart Town there is a small quarry of a hard travertin, the lower strata of which abound with distinct impressions of leaves. Mr. Robert Brown has had the kindness to look at my specimens, and he informed me that there are four or five kinds, none of which he recognises as belonging to existing species.
In the S.E. portion of the island, where the highest land is situated, well characterised trachyte, and other congenerous rocks of that varying family, occur. The overlying basaltic lava is in some parts extremely vesicular, in others little so; it is of a black colour, but sometimes contains crystals of glassy feldspar, and seldom much olivine.
These strata differ from the streams of basaltic lava forming the coast-plains, only in being more compact, and in the crystals of augite, and in the grains of olivine being of much greater size; characters which, together with the appearance of the associated calcareous beds, induce me to believe that they are of submarine formation.
There is not a dull page in the book. The Boy Patriot. A Story of Jack, the Young Friend of Washington. By EDWARD S. ELLIS. 12mo, cloth, olivine edges, illustrated, price $1.50. "There are adventures of all kinds for the hero and his friends, whose pluck and ingenuity in extricating themselves from awkward fixes are always equal to the occasion.
Otis' books are too well known to require any particular commendation to the young." Evening Post. With Warren at Bunker Hill. A Story of the Siege of Boston. By JAMES OTIS. 12mo, ornamental cloth, olivine edges, illustrated, price $1.50.
It was a rushing, noisy torrent, winding along a deep and narrow gorge, which in places almost met overhead. Some patches of olivine and serpentine encouraged me to think that we should find a heavy belt of the rock somewhere along the upper part of the valley, but my hopes were not realized. Day after day passed, and I found no more of it.
I visited only a part of the north-western side of this island, and this part is entirely composed of volcanic rocks. Near the coast there are several varieties of basalt, some abounding with large crystals of augite and tarnished olivine, others compact and earthy, some slightly vesicular, and others occasionally amygdaloidal.
On the northern point of this same island, there were various ancient submarine volcanic rocks, consisting of amygdaloids with dark bole and agate, of basalt with decomposed olivine of compact lava with glassy feldspar, and of a coarse conglomerate of red scoriae, parts being amygdaloidal with carbonate of lime.
A glance at the land showed, as we expected, ideal spots for our wintering station. The rock of the Cape consists mainly of volcanic agglomerate with olivine kenyte; it is much weathered and the destruction had formed quantities of coarse sand. We chose a spot for the hut on a beach facing N.W. and well protected by numerous small hills behind.
I measured the distance between two very small craters, and found that it was only thirty yards from the summit-rim of one to the rim of the other. Small streams of black, basaltic lava, containing olivine and much glassy feldspar, have flowed from many, but not from all of these craters.
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