45

NB Sedgwick talks of laminated structure (∴ separation of ingredients) as uniting with cretionary — it may come of use in discussion on Cleavage &c

Geolog Transacts Vol III p. I p. 86 & p 95

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It is easy to prove (pyrites agates, cinerous balls) that concretions are connected with a crystalline process. — Now cleavage as suggested by Sir J. Herschel is all crystals obeying own laws of crystallization therefore concretions in this case laminar, hence these thick wedges of feldspar in gneiss

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Veins in septaria a kind of concretionary process (analogous to layers of quartz & feldspar) within other concretion.

State last page this point of attempted crystallization & therefore as a consequence aggregated (I suppose the same force which draws together two particles of carb of Lime tend to crystallize them as seen in stalactite). — some force crystallizes minerals in layer & therefore aggregates them in layer.

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So that layer of feldspar is gneiss is identical with layer of flint or cal.: sandstone (& as I believe most strata) (Hence endless passages from gneiss to granite): Why not horizontal? Why have particle in such case moved down laterally than vertically, in concretions more vertically than laterally. — In area of this [sketches]

If surface covered with oil should shrink, film parallel to longer axis. But if great depth

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NB. Prof Sedgwicks lamination parallel to stratification evidently small scale of concretionary action all fluid at once, the films vertical

Ascertain law of alternation of particles of same nature: then get mathematician to when two particles are aggregated would they not attract strong, a third - & this would make layers. — (gravity can have no effect on particles of equal weight)

? cleavage not vertical ∴ combined with gravity.

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Lava changes in dip of no sort of consequence. — Therefore Lº of inclination becomes measure of force. [insertion:] varies with chemical [2 words illeg]

where little inclination with force & varying direction — Therefore in pile of mud from Trapiches inclined

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layer!!!!

The separation in the Ponza case of Scrope parallel to walls of dykes — mem. laminated dikes in Cordillera!!!

[annotated diagram]

In stratum OP let force dray particles to line A B & likewise gravity M, N. Then every particle would tend to meet at [3 lines crossed]

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on the diagonal of BK. — This is not applicable. it does not explain cleavage of rock — nor the Falkland case, nor. the arrangement of particles of granite in Henslow's Grit, yet it is worth consideration. especially effect of gravity, versus some fault explaining vary dip & inclination. —

53

which last in strong character — A discussion on concretions and cleavage conjoined very good — It is the key to the story. — consider stalactites — agate rings crystallization transverse or rather radiating to central point can cleavage be radiation from some grand centre. –

A stalactite of gypsum is the best case of cleavage

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Phillips (113) Lardner Encyclop. — absolutely considers gneiss an aqueo deposit resulting from disintegrated granite!!! Look at gneiss of Rio Concretions in Pumice bed at Ascension instance of hollow concretions & concretion filled with unconsolidated matter —