GLACIAL PERIOD. 
5 
of the British Association for Advancement of 
Science, we started for the mountains of Scot¬ 
land in search of traces of the glaciers, which, 
if there was any truth in the generalizations to 
which my study of the Swiss glaciers had led 
me, must have come down from the Grampian 
range, and reached the level of the sea, as they 
do now in Greenland. 
On the 4th of November of that year, I 
read a paper before the Geological Society of 
London, containing a summary of the scientific 
results of that excursion, which I had extended 
with the same success to Ireland and parts of 
England. This paper was followed by one 
from Dr. Buckland himself, containing an ac¬ 
count of his own observations, and another 
from Lyell on the same subject. Since that 
time, the investigation of glaciers in regions 
where they no longer occur has been carried to 
almost every part of the globe. Before giving 
a more special account of this expedition, I 
will say a word of the mass of facts which I 
had brought from my Alpine researches, on 
which my own convictions were founded, and 
which seemed to Buckland worthy of careful 
consideration. To explain these more fully to 
