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Published online by Cambridge University Press: 01 May 2009
I Propose now to pursue my subject by describing in some detail a series of typical examples of the principal groups of agatescent minerals; noting, as we proceed, the circumstances in each which appear to afford proper ground for future general classification.
1 I have carelessly worded the title of Plate X. as if the two figures were a vertical saotion and surface map; but the lower one is, of course, only explanatory of the upper.