. The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . an artificialproduct, and is an impossibility, unless there is someoneready and willing to hold the natural tendencies of thevegetation in check. In tropical Africa, on the other hand,precisely the same Horal arrangement is produced, but nohuman agency has had anything to do with it ; and theexistence of these natural park-lands presents us with aready-made and an extraordinary puzzle, which it isinteresting to try to understand. In attempting to account for the appe
. The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . an artificialproduct, and is an impossibility, unless there is someoneready and willing to hold the natural tendencies of thevegetation in check. In tropical Africa, on the other hand,precisely the same Horal arrangement is produced, but nohuman agency has had anything to do with it ; and theexistence of these natural park-lands presents us with aready-made and an extraordinary puzzle, which it isinteresting to try to understand. In attempting to account for the appearance of park-lands, the most natural supposition to make is, of course,that of inequality of dampness or character of the soil,which is sufficient to allow some kinds of trees to grow inone place, some in another, and grass in between ; butalthough this view of the matter looks very nice andpromising at first sight, its value is absolutely destroyedby the facts of the case. I have on several occasions,when in a park-land, set my men to trench and dig indifferent directions, and then examined the soil, with the ->i ^ 1.
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