Читать книгу Principles of Sociology - Spencer Herbert - Страница 18

Passing over such traits of climate as variability and equability, whether diurnal, annual, or irregular, all of which have their effects on human activities, and therefore on social phenomena, I will name one other climatic trait that appears to be an important factor. I refer to the quality of the air in respect of dryness or moisture.

Either extreme brings indirect impediments to civilization, which we may note before observing the direct effects. That great dryness of the air, causing a parched surface and a scanty vegetation, negatives the multiplication needed for advanced social life, is a familiar fact. And it is a fact, though not a familiar one, that extreme humidity, especially when joined with great heat, may raise unexpected obstacles to progress; as, for example, in parts of East Africa, where «the springs of powder-flasks exposed to the damp snap like toasted quills; ... paper, becoming soft and soppy by the loss of glazing, acts as a blotter ... metals are ever rusty ... and gunpowder, if not kept from the air, refuses to ignite.»

But it is the direct effects of different hygrometric states, which are most noteworthy – the effects on the vital processes. and, therefore, on the individual activities, and, through them, on the social activities. Bodily functions are facilitated by atmospheric conditions which make evaporation from the skin and lungs rapid. That weak persons, whose variations of health furnish good tests, are worse when the air is surcharged with water, and are better when the weather is fine; and that commonly such persons are enervated by residence in moist localities but invigorated by residence in dry ones, are facts generally recognized. And this relation of cause and effect, manifest in individuals, doubtless holds in races. Throughout temperate regions, differences of constitutional activity due to differences of atmospheric humidity, are less traceable than in torrid regions: the reason being that all the inhabitants are subject to a tolerably quick escape of water from their surfaces; since the air, though well charged with water, will take up more when its temperature, previously low, is raised by contact with the body. But it is otherwise in tropical regions where the body and the air bathing it differ much less in temperature; and where, indeed, the air is sometimes higher in temperature than the body. Here the rate of evaporation depends almost wholly on the quantity of surrounding vapour. If the air is hot and moist, the escape of water through the skin and lungs is greatly hindered; while it is greatly facilitated if the air is hot and dry. Hence in the torrid zone, we may expect constitutional differences between the inhabitants of low steaming tracts and the inhabitants of tracts parched with heat. Needful as are cutaneous and pulmonary evaporation for maintaining the movement of fluids through the tissues and thus furthering molecular changes, it is to be inferred that, other things equal, there will be more bodily activity in the people of hot and dry localities than in the people of hot and humid localities.

The evidence justifies this inference. The earliest-recorded civilization grew up in a hot and dry region – Egypt; and in hot and dry regions also arose the Babylonian, Assyrian, and Phoenician civilizations. But the facts when stated in terms of nations are far less striking than when stated in terms of races. On glancing over a general rain-map, there will be seen an almost-continuous area marked «rainless district», extending across North Africa, Arabia, Persia, and on through Thibet into Mongolia; and from within, or from the borders of, this district, have come all the conquering races of the Old World. We have the Tartar race, which, passing the Southern mountain-boundary of this rainless district, peopled China and the regions between it and India – thrusting the aborigines of these areas into the hilly tracts; and which has sent successive waves of invaders not into these regions only, but into the West. We have the Aryan race, overspreading India and making its way through Europe. We have the Semitic race, becoming dominant in North Africa, and, spurred on by Mahommedan fanaticism, subduing parts of Europe. That is to say, besides the Egyptian race, which became powerful in the hot and dry valley of the Nile, we have three races widely unlike in type, which, from different parts of the rainless district have spread over regions relatively humid. Original superiority of type was not the common trait of these peoples: the Tartar type is inferior, as was the Egyptian. But the common trait, as proved by subjugation of other peoples, was energy. And when we see that this common trait in kinds of men otherwise unlike, had for its concomitant their long-continued subjection to these special climatic conditions – when we find, further, that from the region characterized by these conditions, the earlier waves of conquering emigrants, losing in moister countries their ancestral energy, were over-run by later waves of the same kind of men, or of other kinds, coming from this region; we get strong reason for inferring a relation between constitutional vigour and the presence of an air which, by its warmth and dryness, facilitates the vital actions. A striking verification is at hand. The rain-map of the New World shows that the largest of the parts distinguished as almost rainless, is that Central-American and Mexican region in which indigenous civilizations developed; and that the only other rainless district is that part of the ancient Peruvian territory, in which the pre-Ynca civilization has left its most conspicuous traces. Inductively, then, the evidence justifies in a remarkable manner the physiological deduction. Nor are there wanting minor verifications. Speaking of the varieties of negroes, Livingstone says – «Heat alone does not produce blackness of skin, but heat with moisture seems to insure the deepest hue»; and Schweinfurth remarks on the relative blackness of the Denka and other tribes living on the alluvial plains, and contrasts them with «the less swarthy and more robust races who inhabit the rocky hills of the interior»: differences with which there go differences of energy. But I note this fact for the purpose of suggesting its probable connexion with the fact that the lighter-skinned, races are habitually the dominant races. We see it to have been so in Egypt. It was so with the races spreading south from Central Asia. Traditions imply that it was so in Central America and Peru. Speke says: – «I have always found the lighter-coloured savages more boisterous and warlike than those of a dingier hue.» And if, heat being the same, darkness of skin accompanies humidity of the air, while lightness of skin accompanies dryness of the air, then, in this habitual predominance of the fair varieties of men, we find further evidence that constitutional activity, and in so far social development, is favoured by a climate conducing to rapid evaporation.

I do not mean that the energy thus resulting determines, of itself, higher social development: this is neither implied deductively nor shown inductively. But greater energy, making easy the conquest of less active races and the usurpation of their richer and more varied habitats, also makes possible a better utilization of such habitats.