QEOLOGY OK POLlv'ESTONE — TIIR OAULT. 
87 
also identify him personally by showing his relations to the head of 
his house, his connections and alliances." 
So with the geologist: when petrological conditions, chemical 
analysis, or microscopic investigation fail at first to give the clue, we 
may still find the key to the solution of a physical fact in the evi- 
dence of some simple, even it may be some obscure thing. But the 
key to the geological history of this valuable band of mineral manure 
has not yet been found. There, however, is that narrow seam of 
A 
Lign. 11. — Copt Point, from the East Pier of Folkestone Harbovir. 
A, Gaulf. d. Stratum of phosphatic casts of Ammonites Benetianm, B, "Junction-bed," 
composed of nodules of phosphate of Unie, with casts of Ammonites mammilari» and gnarled 
pieces of wood, bored by Toredo. C, Lower gfeenmad. e. Stratum of small phosphatic 
casts of Ammonitea mammilaris, bivalves, and Dentalia. 
rounded nodules, offering 40 per cent, of fertilizing phosphate, per- 
sistent everywhere with the gault itself. All round the chalk-downs, 
in their range from close by this point on which now we stand, 
through garden-like Kent, and past the charming rustic hamlets of 
beautiful Surrey to the bleak Sussex coast have I, walking through 
green refreshing lanes and over stubbled fields, traced out this fer- 
tilizing band. On the northern shores of France, between where the 
now forsaken but once active port of Ambleteuse presents its pierced 
and mouldering piles, and Wissant, the gault again comes out to 
view, and this narrow sombre-coloured junction-seam again is there. 
