What, It May Naturally Be Asked, Was The Character
Of The Vegetation At That Period; Was The Country As Wretchedly
Sterile As It Now Is?
As so many of the co-embedded
shells are the same with those now living in the bay, I
Was
at first inclined to think that the former vegetation was
probably similar to the existing one; but this would have
been an erroneous inference for some of these same shells
live on the luxuriant coast of Brazil; and generally, the
character of the inhabitants of the sea are useless as guides
to judge of those on the land. Nevertheless, from the following
considerations, I do not believe that the simple fact
of many gigantic quadrupeds having lived on the plains
round Bahia Blanca, is any sure guide that they formerly
were clothed with a luxuriant vegetation: I have no doubt
that the sterile country a little southward, near the Rio
Negro, with its scattered thorny trees, would support many
and large quadrupeds.
That large animals require a luxuriant vegetation, has
been a general assumption which has passed from one work
to another; but I do not hesitate to say that it is completely
false, and that it has vitiated the reasoning of geologists
on some points of great interest in the ancient history of
the world. The prejudice has probably been derived from
India, and the Indian islands, where troops of elephants,
noble forests, and impenetrable jungles, are associated together
in every one's mind. If, however, we refer to any
work of travels through the southern parts of Africa, we
shall find allusions in almost every page either to the desert
character of the country, or to the numbers of large animals
inhabiting it. The same thing is rendered evident
by the many engravings which have been published of various
parts of the interior. When the Beagle was at Cape
Town, I made an excursion of some days' length into the
country, which at least was sufficient to render that which
I had read more fully intelligible.
Dr. Andrew Smith, who, at the head of his adventurous
party, has lately succeeded in passing the Tropic of Capricorn,
informs me that, taking into consideration the whole
of the southern part of Africa, there can be no doubt of its
being a sterile country. On the southern and south-eastern
coasts there are some fine forests, but with these exceptions,
the traveller may pass for days together through open plains,
covered by a poor and scanty vegetation. It is difficult to
convey any accurate idea of degrees of comparative fertility;
but it may be safely said that the amount of vegetation
supported at any one time [5] by Great Britain, exceeds,
perhaps even tenfold, the quantity on an equal area, in the
interior parts of Southern Africa. The fact that bullock-
waggons can travel in any direction, excepting near the
coast, without more than occasionally half an hour's delay
in cutting down bushes, gives, perhaps, a more definite notion
of the scantiness of the vegetation. Now, if we look to the
animals inhabiting these wide plains, we shall find their
numbers extraordinarily great, and their bulk immense. We
must enumerate the elephant, three species of rhinoceros,
and probably, according to Dr. Smith, two others, the hippopotamus,
the giraffe, the bos caffer - as large as a full-grown
bull, and the elan - but little less, two zebras, and the
quaccha, two gnus, and several antelopes even larger than these
latter animals. It may be supposed that although the species
are numerous, the individuals of each kind are few.
By the kindness of Dr. Smith, I am enabled to show that
the case is very different. He informs me, that in lat. 24 degs.,
in one day's march with the bullock-waggons, he saw, without
wandering to any great distance on either side, between
one hundred and one hundred and fifty rhinoceroses, which
belonged to three species: the same day he saw several herds
of giraffes, amounting together to nearly a hundred; and
that although no elephant was observed, yet they are found
in this district. At the distance of a little more than one
hour's march from their place of encampment on the previous
night, his party actually killed at one spot eight
hippopotamuses, and saw many more. In this same river there
were likewise crocodiles. Of course it was a case quite
extraordinary, to see so many great animals crowded together,
but it evidently proves that they must exist in great numbers.
Dr. Smith describes the country passed through that
day, as "being thinly covered with grass, and bushes about
four feet high, and still more thinly with mimosa-trees."
The waggons were not prevented travelling in a nearly
straight line.
Besides these large animals, every one the least acquainted
with the natural history of the Cape, has read of
the herds of antelopes, which can be compared only with the
flocks of migratory birds. The numbers indeed of the lion,
panther, and hyaena, and the multitude of birds of prey,
plainly speak of the abundance of the smaller quadrupeds:
one evening seven lions were counted at the same time prowling
round Dr. Smith's encampment. As this able naturalist
remarked to me, the carnage each day in Southern Africa
must indeed be terrific! I confess it is truly surprising how
such a number of animals can find support in a country
producing so little food. The larger quadrupeds no doubt
roam over wide tracts in search of it; and their food chiefly
consists of underwood, which probably contains much nutriment
in a small bulk. Dr. Smith also informs me that the
vegetation has a rapid growth; no sooner is a part consumed,
than its place is supplied by a fresh stock. There can be
no doubt, however, that our ideas respecting the apparent
amount of food necessary for the support of large quadrupeds
are much exaggerated: it should have been remembered
that the camel, an animal of no mean bulk, has always been
considered as the emblem of the desert.
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