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REMARKS BY J. THORNHILL HARRISON, ESQ., E.G.S., M.I.C.E. 
The author’s first question is, “ In what formation have we found con- 
clusive evidence that man was there P ” 
Leaving the earlier formations, he brings within view the latest beds known 
to geologists, the Tertiary and Post-tertiary. These beds bear evidence of the 
truth of the Mosaic record, as to the creation on the sixth day, first of the 
mammals, then of man. 
The Tertiary beds contain remains of mammals, but, as the author says, the 
evidence is insufficient to prove that man was there. 
In the Post-tertiary beds remains of man are, for the first time, found em- 
bedded in the earth ; but when within the range of this deposit was man 
created ? That is the question. 
Lyell subdivides the Post-tertiary into Post-pliocene and Recent. The former 
embraces the period known as Glacial ; part, often a considerable part, of the 
mammalia of this period belongs to extinct species ; whereas the mammalia 
as well as shells found in deposits of the 'Recent period are identical with 
species now living. 
That man existed on the earth during the deposit of beds of the Recent 
period there is no question. The objects found in caves and in the Post-glacial 
river-gravels are admitted to be really of human workmanship. The point 
chiefly contested by the author is the existence of man in Glacial and Inter- 
glacial times ; and upon this he says that “ all the evidence is to him quite 
inconclusive,” at the same time he admits that traces of man with the extinct 
mammalia have been found in caves and Post-glacial river-gravels. 
Let me ask. What evidence is there of the existence of the mammals 
during the Glacial period which does not equally apply to man ? There is 
evidence of the pre-existence of the mammals, and we conclude therefore their 
continued existence during the Glacial period, but it by no means follows that 
during that period man was not co-existent. It is admitted that man lived 
along with the extinct mammalia, and it seems to me probable that he did so 
only during the Glacial period. Let this question be answered, What occa- 
sioned the extinction of the mammals, and how docs man survive P 
The author says, “ In the long periods of geologic time races appear and 
last awhile, and then are not, and a new group of living things represents 
them in the next succeeding age. How they went out we cannot tell. It 
was not by cataclysms, for they go out one by one, and the deposits tell of 
slow accumulation ; but more as if some gradual change over various regions of 
the earth made each successive place in time unsuitable for all the life that 
once was there.” 
It was not thus the mammals ceased to be ; they were in man’s time, but 
are not. There still remains, within the polar circle, undissolved throughout 
