Excerpt from The Journal of Geology, Vol. 8: July August, 1900

It appears then that in general the diagram of a rock-series will consist of curved lines to indicate the variations in percent age amount of the several bases'. Of these curves we may dis distinguish two kinds: (a) When the constituent in question first increases to a maximum and then decreases, or increases first more rapidly and then less rapidly, or decreases first less rapidly and then more rapidly, the curve will be Eonvex upward, (é) When it decreases to a minimum and then increases, or decreases first more rapidly and then less rapidly, or increases first less rapidly and then more rapidly, the curve will be concave upward. This. Classification is not an exhaustive one, for there may be curves which are in¿ected, being convex in one part and concave in another, but it will be sufficient to consider the simpler cases. Since the sum of the ordinates for all the bases falls off steadily in linear fashion, its curve of variation 'being the straight line yx, it follows that in any series, other than an ideal linear one, some of the bases must give convex and others concave curves.

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