235 
*** Since the foregoing paper was read I have received 
“ a sample of deposit from clear running water/' as likely to 
be of interest in reference to cave deposits. “ It was formed 
in eight weeks to a thickness of one inch and a half ; the 
water flowing behind an iron casing in a pit-shaft passed 
through a large quantity of lime, but flowed a perfectly clear 
water to the pump at the bottom. The deposit was formed 
uniformly over the surface of a four-inch pipe, reducing its 
diameter in eight weeks to less than one inch; but it has 
crystallised and grown in lines like the section of a tree, just 
as if it had taken a few thousand years to do it. No doubt a 
very few more weeks would have exhausted the supply of 
lime placed in the shaft or behind the casing, and it would 
have taken a great many thousand years to add as much 
again to the deposit in question." 
A section of this deposit, from Hampton Colliery, near 
Wednesbury, I shall have the pleasure of depositing in the 
library of the Institute. It illustrates in a remarkable manner 
the formation of the “ old floor of crystalline stalagmite 33 
(see page 10, ante). 
The following paper was then read by Mr. T. K. Callard, F.G.S. < 
IMPLEMENTS OF THE STONE AGE A PRIMITIVE 
DEMARCATION BETWEEN MAN AND OTHER 
ANIMALS. By Joseph P. Thompson, D.D. LL.D.* 
W HEREVER on the face of the globe there is found an 
implement of any sort, we say, at once, Man has been 
here. It may be that, as in the caves in the Dordogne, there are 
rude sketches of art to associate the flint and bone implements 
with the handiwork of man ; or, as in the lake findings in Swit- 
zerland, there may be traces of human habitations to identify 
the stone utensils with the buiiding of the pile-dwellings ; 
or, as in the shell-mounds (Kjokkenmoddings) of Denmark, 
a rained hearth-stone and the bones of birds and animals of 
* The late, 
s 
VOL. XV. 
