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\From the Quarterly Journal of the Geological Society of LondonNo. IT, for February 1849.]

1. On the Development of the Permian System in Saxony , ascommunicated by Professor Naumann to Sir Roderick Mur-chison , G.C.S., F.R.S. &c.

Those geologists who have attended to the recent progress in theclassification of the palaeozoic rocks may well suppose that I washighly gratified by receiving the letter from Professor Naumann ofLeipsie, of which I now send a translation. The reasons for theadoption of the term Permian were so thoroughly explained, first ina letter addressed by me to Dr. Fischer of Moscow *, next in com-munications to the Geological Society of London , and lastly in thework on Russia and the Ural Mountains , that I have now only torefer to those documents. But I would specially call attention to thefirst pages in the tenth chapter of the last-mentioned work, becausethey were written after a visit to Thuringia, Saxony and Silesia, whichconfirmed and extended the view I had adopted from the survey ofRussia; viz. that the Zechstein and Kupferschiefer were mere sub-ordinate members of a great red sandstone group, of which the

* Phil. Mag., Dec. 1841.