29. Carex _membranacea_, Hook. Fl. Bor. Am. ii. p. 220. 30. Carex _cæspitosa_, L.--Hook. Fl. Bor. Am. ii. p. 217. 31. Carex _ustulata_, Wahl.--Hook. Fl. Bor. Am. ii. p. 224. 32. Eriophorum _capitatum_, Host.--Hook. Fl. Bor. Am. ii. p. 231. GRAMINEÆ, _Juss._ 33. Hierochloe _alpina_, Roem. and Sch.--Hook. Fl. Bor. Am. ii. p. 234. 34. Colpodium _latifolium_, Br.--Hook. Fl. Bor. Am. ii. p. 238. 35. Dupontia _Fischeri_, Br.--Hook. Fl. Bor. Am. ii. p. 242. 36. Poa _Arctica_, Br.--Hook. Fl. Bor. Am. ii. p. 246. 37. Poa _angustata_, Br.--Hook. Fl. Bor. Am. ii. p. 246. 38. Poa _alpina_, L.--Hook. Fl. Bor. Am. ii. p. 246. SPECIMENS OF ROCKS, _Described by JAMES TENNANT, ESQ., Professor of Mineralogy in King's College, London._ CAPE LADY PELLY, 67° 30' N. 88° W. Gneiss. NEAR POINT HARGRAVE, 67° 25' N. 87° 35' W. Gneiss. CAPE T. SIMPSON, 67° 22' N. 87° W. Gneiss with chlorite. Mica-slate. Mica-slate, with indistinct crystals of precious Garnets. ISTHMUS connecting Ross's Peninsula with the Continent. Felspar. SIMPSON'S PENINSULA, 68° 1/3' N. 88° 20' W. Compact argillaceous Limestone. A HILL on the western shore of Halkett's Inlet, 69° 14' N. 90° 50' W. Cellular Quartz, coloured by oxide of Iron. Mica-slate full of Garnets. HELEN ISLAND, one of the Harrison Group in Pelly Bay, 68° 54' N. 89° 52' W. Felspar--red colour. Gneiss; the Felspar, Mica, and Quartz distinctly stratified. Gneiss; the Felspar red and greatly predominating. BEACON HILL, near Fort Hope, 66° 32' N. 86° 56' W. Granite. Ditto, with a small quantity of Mica; the Felspar red, and constituting four-fifths of the mass. Gneiss, with veins of red Felspar running diagonally to the stratification. Mica-slate. NORTH POLE RIVER. Mica-slate. Ditto, with veins of Quartz. Gneiss. Ditto, the Felspar red and greatly predominating. Ditto, the Felspar very friable. Quartz rock with Felspar. Argillaceous Limestone, compact. NORTH POLE LAKE, 66° 40' N. 87° 2' W. Gneiss. Mica-slate. REPULSE BAY, 66° 32' N. 86° 56' W. Quartz, coloured by oxide of Iron, and containing minute particles of Gold. MELVILLE PENINSULA, 68° 27' N. 85° 24' W. Hornblende-slate. MUNRO INLET. Granite, the Felspar greatly predominating. ISLAND near the north point of Rankin's Inlet. Quartz, enclosing chlorite and Copper Pyrites. Talcose-slate. Carbonate and silicate of Copper, with Copper Pyrites on argillaceous slate. Ditto, with a thin coating of green carbonate of Copper. Mica-slate. Chlorite-slate, friable. Ditto, with very thin veins of Calcareous Spar running diagonally in stratification. ISLAND near the south point of Rankin's Inlet.