Chapter V

. treats of "the Absence of extensive modern Conchiferous Deposits in South America; and on the contemporaneousness of the older Tertiary Deposits at distant points being due to contemporaneous movements of subsidence." Darwin expresses the view that "the earth's surface oscillates up and down; and...during the elevatory movements there is but a small chance of durable fossiliferous deposits accumulating" (loc. cit., page 139).)

## Chapter VI .--Perhaps some facts on metamorphism, but chiefly on the

layers in mica-slate, etc., being analogous to cleavage.

## Chapter VII .--The grand up-and-down movements (and vertical silicified

trees) in the Cordillera: see summary, page 204 and page 240. Origin of the Claystone porphyry formation, page 170.

##