180 E. Andrews on Human Antiquities at Abbeville, ke. 
is fused with carbonate of soda, and the fused mass powdered 
and treated with water, uorid of sodium is dissolved out. 
This method, however, cannot compare with the first for con- 
venience and econom 
It may not be altogether out of place to remark in this, con- 
nection, that I find that when fluorid of sodium is heated with 
sulphate of ammonia, fluorid of ammonium is formed an 
— Possibly this may be turned to advantage, although 
I have made no experiments upon obtaining fluorid of ammo- 
mia in quantity by this process 
Before closing this paper I also wish to state that I made 
humerous experiments with a view toward applying the mixture 
of fluorid of sodium and bisulphate of potash to the estimation 
of both oxyds of iron when they occur in minerals; but I met 
~~ no success, 
uring the course of the experiments described in this s paper, 
I have been largely indebted to Dr. Wolcott Gibbs for many 
very valuable a and much excellent marion which 
aided me exceeding 
Art. XX.—Re#xamination of the localities of Human Antiqui- 
ties at Abbeville, Amiens, and Villeneuve’; by E. ANDREWS, 
., Professor of Cicail in Chicago Medical Col- 
lege. 
Dvrrve a recent sojourn in Europe, I relieved the arduousness 
of other duties by an occasional examination of famous geolog- 
ical localities. During these visits, some facts fell under my 
notice, which I have not seen mentioned in European works, 
and others forced upon my mind totally different inferences 
from those usually drawn. Among the ‘localities visited were 
Amiens, Abbeville, and other pone of the valley of the river 
mme in France, in whose gravel beds are found flint hatchets 
and the bones of Man in connection with the bones of the 
_ primigenius, the Rhinoceros tichorhinus, and 0 
eriver Somme is a small stream, appar- 
ently about fifty feet wide, meandering along the “flat floor of 
an ancient watercourse of much greater dimensions. The val- 
ley is about a mile and a half in breadth from summit to sum- 
mit of the bluffs, and not t far from two hundred feet in depth. 
In the lo lower part of its course, it is purely a valley of erosion, 
excavated in soft chalk; but above Amiens it expands into wide 
; which are a ntly the natural undulations 
which existed dha the land rose from the 8, 
