Pages Darwin and his Teachings. [ April, 
difference in species is superinduced “during a length of time ;” 
and if we turn to his later work, we find that “neither the 
similarity nor dissimilarity of the inhabitants of various regions 
can be accounted for by their climatal and other physical con- | 
ditions,”"* but that barriers of any kind, or obstacles to free migra- 
tion are related in a close and important manner to the differences 
between the productions of various regions. He exemplifies this 
law by showing that whilst there is a very slow and gradual variation 
of species as one travels north and south on the continent of South 
America, the land barrier of the Andes causes us to find abrupt 
changes in species on the opposite sides of those mountains, though 
the actual longitudinal distance between the two regions may be 
small. Thus he seeks to prove that, in both cases, tame, and not 
miracle, has been the cause of the change in species, either in per- 
mitting migration to regions with different physical conditions, or 
im raising a barrier which impeded migration and so left the 
inhabitants nearly but not immediately allied. 
But if we find in the ‘Journal of Researches’ a very large store 
of information, which might have been successfully employed, had 
the author been so minded, in the establishment of his later theories, 
we cannot help being struck by the significant fact that there are 
many data which we should naturally have expected to find in his 
‘Origin of Species, if his theory were founded on a sound and 
immutable basis. ‘The young naturalist was not content to observe 
living plants and animals, rocks and fossils, but he directed a large 
share of his attention to men and manners, and had the opportunity 
so rarely afforded to naturalists of seeing, side by side, the very 
lowest and the highest types of mankind; and yet, to quote the 
swords of one of his most enthusiastic and eminent disciples, “ Mr. 
Darwin has said nothing about man in his book;” but, “if Mr. 
Darwin’s views are sound, they apply as much to man as to the 
lower animals.” t 
Now it is a circumstance which has more than once come under 
our own observation, that persons who have traded on the west 
coast of Africa, and have come into contact with the savages there 
(although the latter have, to some extent, enjoyed the advantages 
of European intercourse), have been almost irresistibly led to 
embrace Darwin’s views, on the ground that the untutored beings 
whose habits they have been compelled to observe approximate so 
closely to the brutes. But the great naturalist has witnessed even 
more striking contrasts than they, and yet practically he is silent as 
to the origin of man. 
* «Origin of Species,’ p. 376. + Ibid., p. 376. 
¢ Professor Huxley: ‘Lectures to Working Men.’ It is, however, only fair 
to Darwin to add that this must not be taken literally, for he does say that he 
expects to see light thrown on the origin and history of man, should his theory be 
confirmed.—‘ Origin of Species,’ 1st edition, p. 489, 1. 3 and 4; 3rd edition, p- 523, 
1, 33, 34. 
