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SOME NOTES ON ARBOR LOW. TO5 
extinct animals, and when man had learnt to grind and polish his 
stone implements, and also to make rude pottery. 
III. Bronze Age, when man’s implements were of a combina- 
tion of copper and tin. 
IV. Iron Age, when that metal superseded the use of bronze. 
V. Historic Age, from the advent of the Romans to the 
present day. 
These conclusions have been arrived at from the careful study 
of the contents of grave-mounds, or barrows. Denmark abounds 
in these ancient interments, and the theory of the successive ages 
of stone, bronze, and iron, was propounded by antiquaries of that 
country. To Sir John Lubbock we are indebted for the useful 
division of the Stone Age into Paleolithic and Neolithic. Ac- 
cording to the hard lines of the Danish system, when a barrow or 
tumulus contained bronze, it was assigned to a period beginning 
one or two thousand years before the Christian era ; if iron, from 
the Christian era to about A.D. 1000; if no metal, but stone or 
bone implements, then its date was at least 1000 B C., probably 
2000 B.C., and possibly 10,000 or 20,000 B.c. But, true as is 
the order of succession of these ages, more accurate observation 
certainly establishes the fact that all these ages very considerably 
overlap each other. ‘The mingled and various contents of English 
barrows, and in none is this mingling and variation so remarkable 
as in the Derbyshire barrows opened by Messrs. Bateman, prove 
conclusively the absurdity of drawing absolute conclusions from 
the presence of weapons that originated at a special era. Take 
four Derbyshire barrows as samples. At Cross Flats there were 
found with the skeleton, an iron knife and a flint spear head ; at 
Gatley Lowe, a gold necklace set with garnets, a coin of Honorius, 
a flint arrow head, and a piece of iron stone ; at Rolley Lowe, a 
brass coin of Constantine, a brass pin, some ornamented pottery, 
and several flint weapons ; and ina barrow on Ashford Moor, iron 
and flint arrow heads side by side. Roman coins and Anglo- 
Saxon ornaments have been found in various other barrows in this 
immediate neighbourhood in conjunction with iron and stone 
implements. All the customs and habits of our daily life show 
