Nature . of unequal size, VictoriaLand and Edward VII. Land, separ-ated by a great barrier of ice, andof two seas extending far to thesouth, the Ross Sea and the WeddellSea. The papers by Dr. Harvey Pirieand Mr. Mossman contain manypoints of great interest, although inthe nature of things the material1 1 llei ted requires further elabor-ation, and comparison with that ofthe other expeditions, before its fullvalue becomes apparent. Dr. Harvey Piries observations givemuch additional information bear-ing on the variations in the relativeamounts of diatoms in the surfacewaters and in the deposits,


Nature . of unequal size, VictoriaLand and Edward VII. Land, separ-ated by a great barrier of ice, andof two seas extending far to thesouth, the Ross Sea and the WeddellSea. The papers by Dr. Harvey Pirieand Mr. Mossman contain manypoints of great interest, although inthe nature of things the material1 1 llei ted requires further elabor-ation, and comparison with that ofthe other expeditions, before its fullvalue becomes apparent. Dr. Harvey Piries observations givemuch additional information bear-ing on the variations in the relativeamounts of diatoms in the surfacewaters and in the deposits, and theremarkable differences in the meteor-ological values for 1903 and 1904enable Mr. Mossman to draw manyimportant conclusions as to thefactors controlling the climate. Brown gives an interestinghow the position of the account of an island which has, curiously enough, remained unex-plored until now, although it liesalmost on the track of sailing-ships outward bound viathe (ape of Good THE PERCY SLA DEN EXPEDITION SEALARK. T HAVE just received the accompanying communi-cation from Mr. Stanley Gardiner, bringing theaccount of his expedition to September 12, the dateof his letter. The letter is written from may remind readers of Nature that his formercommunications appeared in the issues of August 10and October 5. A. Sedgwick. Zoological Laboratory, Cambridge, October 23. miles further south than it was previously known to is thus a ridge extending in a curve from Mada-gascar^ Bouvet Island, and from Bouvet Island to theSandwich Group, whence there is a forked connectionthrough the South Orkneys to Grahams Land, and Since my last letter Cooper and I have had a tourround the reefs of Mauritius, and have for the lastthree weeks been working between the latter islandand the Seychelles Group. The Mauritius reefs varyfrom fringing to barrier, the best example of thelatter being at Grand Port, where it is four milesfrom the land. It


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