Flint Implements of Addington. 261 
yellow or cream colour, and have no bulbs of percussion, even in 
the smallest specimens. 
For the third division, I have retained the old name of palao- 
lithic ; these are of a dull creamy white, the deteriorated surface 
is rough to the touch, and percussion bulbs are almost wholly 
absent ; the forms are very simple, and secondary work is un- 
common. 
The fourth or mesolithic division holds a middle place between 
the palxolithic and the neolithic ; it consists of well chipped and 
frequently elegant implements of a smooth surface, white, bluish 
white, or grey in colour, sometimes porcelainous, and never so 
7 much deteriorated as to be rough to the touch. Percussion bulbs 
in this division are frequent. 
The fifth division, which I have called proto-neolithic, as being 
next preceding the neolithic, consists of implements differing in 
style and in method of fabrication both from those that preceded 
and those that followed their epoch. Their colour is usually 
black or grey, with blotches or streaks of opaque white. They 
are frequently shaped from pieces of tabular flint, are roughly 
made, and never exhibit bulbs of percussion. 
The neolithic hardly needs to be characterised. The surface 
of the implements has not undergone much change, the normal 
colours of the flints being preserved. In the older examples 
white streaks or cloudy spots have made their appearance, and 
bulbs of percussion are frequently met with. 
These divisions will be found to harmonise with the geological 
changes that have produced the features of the country around, 
and the different classes are proper to certain zones of elevation. 
For instance, the eolithic are rarely found on the surface below 
450 ft., the mesolithic below 350 ft., or the proto-neolithic below 
300 ft.; while the neolithic occur at all elevations. So far as I 
have yet been able to observe, these figures will apply to the 
whole of the London Basin, and as the age of any gravel is the 
age of the newest implement it contains, this arrangement will 
at least provide a means of arriving at the relative ages of beds 
in cases where other methods are not available, and to unite 
together more closely the sciences of archeology and geology. 
____ My object has been to introduce to your notice some of the im- 
_ plements that are to be found within the limits of a moderate 
walk, and to show that the materials for the study of prehistoric 
_ archeology are, in this part of the country, within the reach of 
all whose tastes tend in that direction. 
Through the kindness of Mr. Whitaker, I am enabled to ex- 
hibit on the table this beautiful example of the implements 
_ found in the gravel-beds of St. Acheul, in the department of 
c the Somme, in South-eastern France. This has been worked by 
4 the detachment of a great number of large flakes to a sharp flat 
