On the Phosphoric Strata of the Chalk Formation. 
79 
Insoluble silicious matter . . . . . 43'87 
Soluble silica . . ... 3-25 
Organic matter, water, and fluorine , . . 3 "44 
Phosphoric iicid (equal to 42 "48 of bone-earth 
phosphate) 20-80 
Carboniite oflime . . . • . 1'06 
Lime in combination with phosphoric acid . 23 '86 
Oxide of iron and ahuuina .... 3'35 
Magnesia and loss . . . . . . 0'37 
100-00 
Another outcrop has been followed out in the commons at a 
spot distant about half a mile S.W. from the above pit ; but here 
there is only one bed beneath the iron-sandstone. On diggfing- 
the fossils the mass is broken to pieces with a pickaxe and passed 
throug;h a half-inch sieve; just in the same manner as gravel is 
obtained for road-making. When the fossils become tolerably 
drj, they are then passed over a finer sieve, which gets rid of the 
greater part of the loose adhering sand. About twenty tons of 
clean fossils have been dug from these two sites, at a cost of fifteen 
shillings per ton. 
The fossils are easily ground up into powder between cylin- 
drical rollers. The same mill is employed to grind the fossils 
both of the upper and lower green-sand. If a higher percentage 
of phosphate of lime were required for any particular purpose, 
it might be raised to about 55 or 60 per cent, by a subsequent 
process of sieving, which separates the coarser grains of sand 
from the powder. It is worthy too of special remark, that the 
fossils of these lower green-sand beds contain scarcely any car- 
bonic acid. 
With the more definite fossils are intermixed masses of a brown- 
ish-coloured wood, in most instances bored by teredines ; there are 
also many round or oblong nodules vvilhout definite fossils, the form 
of which was probably determined by the littoral action of the 
waves on a former sea-beach. These nodules, on being fractured, 
exhibit in the middle a yellow-reddish tinge, somewhat similar in 
appearance to the interior of the so-called Suffolk coprolite. No 
organic structure has been detected in the majority of them, 
though some of them contain fragments of ammonites, &c. 
Some are not larger than hazel-nuts, others weigh three or four 
pounds each. Associated with the fossils are also many irre- 
gularly shaped masses not at all water-worn ; these appear to 
have been derived from the decomposition of the fossils, and the 
phosphate of lime has recombined with the surrounding sand, 
forming lumps very like pieces of coarse mortar. 
On the western side of the parish of Frensham there is a continuation 
