. Acadian geology [microform] : the geological structure, organic remains and mineral resources of Nova Scotia, New Brunswick and Prince Edward Island. Geology; Paleontology; Geology; Geology; Geologie; Paléontologie; Géologie; Géologie. THE FLORA OP THE COAL FORMATION. 427. the cell walls (C, c). It is not distinguishable from that of Pinites [Dadoxylon) Brandlingii of Witham, or from that of the specimens figured by Professor Williamson. The wood and transverse partitions are perfectly silicified, and of a dark-brown colour. The partitions are coated with small colourless crystals of quartz
. Acadian geology [microform] : the geological structure, organic remains and mineral resources of Nova Scotia, New Brunswick and Prince Edward Island. Geology; Paleontology; Geology; Geology; Geologie; Paléontologie; Géologie; Géologie. THE FLORA OP THE COAL FORMATION. 427. the cell walls (C, c). It is not distinguishable from that of Pinites [Dadoxylon) Brandlingii of Witham, or from that of the specimens figured by Professor Williamson. The wood and transverse partitions are perfectly silicified, and of a dark-brown colour. The partitions are coated with small colourless crystals of quartz and a little iron pyrites, and the remaining spaces are filled with crystalline laminaj of sulphate of barytes. Unfortunately this fine specimen does not possess enough of its woody tissue to show the dimensions or age of the trunk or branch which contained this enormous pith. It proves, however, that the pith itself has not been merely dried and cracked transversely by the elon- gation of the stem, as appears to be the case in the liutternut [Juglans cinerea), and some other modern trees, but that it has been condensed into a firm epidermis-like coating and partitions, apparently less de- structible than the woody tissue which invested them. In this speci- men the process of condensation has been carried much farther than in that described by Professor Williamson, in which a portion of the un- altered pith remained between the Sternbergia cast and the wood. It thus more fully explains the possibility of the preservation of such hollow-chambered piths after the disappearance of the wood. It also shows that the coaly coating investing such detached pitli-casts is not the medullary sheath, properly so called, but the outer part of the con- densed pith itself. The examination of this specimen having convinced me that the structure of Stcrnbergiai implies something more than the transverse cracking observed in Juglandacere, I proceeded to compare it with other piths, and especia
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Keywords: ., boo, bookcentury1800, booksubjectgeology, booksubjectpaleontology
