58 
Oxide of Iron... bee a0 PF OC tera. Ge 
Silicious Matter ... vies 2IK9Bis wc HLG:29e 
100.00 100.00 
The brown rounded pebbles in the Crag contain a large 
proportion of calcic phosphate, mixed with calcic carbonate 
and flouride, according to Dr. Miller. By these analysis, a 
comparison may be drawn between the chemical composition 
of the chief depositories of these nodules which are most 
valuable for agricultural purposes. They are carefully sort- 
ed, washed and ground in a mill, and then treated with an 
acid and they become a bi-phosphate, and in due course are 
rendered fit for the market. Some persons have an antipathy 
to bone manures, under the idea that they are apt to be used by 
fraudulent millers and bakers, to mix with the flour. But 
as the former article is expensive and usually more costly 
than the latter, they need not have much fear on this 
account. Perhaps they are not aware that the Pyramids 
are rifled of their contents by cunning Arabs; and Egyptian 
Mummies are imported into this country, and the dust large- 
ly employed, especially in Norfolk and Suffolk as a bone 
manure; so that indirectly some of us may be deriving our 
bread food from trucculent Egyptian Pharaohs, and dark-eyed 
beauties of Thebes and Memphis. I cannot say what they 
might have thought of the matter if they had known that 
in future ages their dust would have been employed to 
improve the soil of a little far distant and then unknown 
island, which has since helped to people and civilize a large 
portion of the known world. 
I now come to the consideration of the peculiar strata 
called ‘bone beds,’ which though not of any commercial 
