Olivine Gabbro. From Bluff Hill A rather coarse-grained, dark-grey, granular rock. Specific gravity = 2.916. Section.—Plagioclase in broad laths and plates composes about one-half of the rock; the other half is ferro-magnesian minerals. Diallage is allotriomorphic, pale-purple in colour, and forms ophitic plates enclosing the plagioclase and olivine; in places it is decomposed into chlorite. The olivine is colourless, in rounded crystals, much decomposed on the margins and in cracks; it is not abundant. Magnetite is in small quantity. There is also a little pyrites. Greenstone Ash. From Green Hills. Fine-grained, dark-green rocks, sometimes laminated with finer and coarser materials. These rocks are the diabasic ash of Mr. Park. Thin sections show them to consist of minute angular fragments of feldspar, much decomposed, but chiefly orthoclase, abundantly infiltrated with chlorite. There is no quartz. Pyrites occurs commonly.

Art. XXXVI.—On the Murchison Glacier. By G. E. Mannering. [Read before the Philosophical Institute of Canterbury 4th September, 1890.] Plate XXXV. Introductory.—Some Remarks on the Principal New Zealand Glaciers. It is a strange fact that the average New-Zealand knows but little of the physical features of his own country. It is strange that he knows still less of its great mountains and glaciers, and of all the marvels of nature which immediately surround them; but it is stranger yet that there should lie hidden for so many years a glacier of such extent and importance as the Murchison, whose ice was trodden for the first time in the summer of last year. It is also interesting to note that almost all scientific explorations and records concerning our essentially alpine mountains have been made by foreigners or visitors to our shores. The principal New Zealand glaciers on the eastern side of the main range are situated in the very heart of the Southern Alps, and comprise those at the head-waters of the Rangitata River—namely, the Havelock, Clyde, and Lawrence Glaciers;