History of the Intellectual Development of Europe, Volume I (of 2) / Revised Edition

by John William Draper

They who can see no difference between the race-horse and the Shetland pony, the bantam and the Shanghai fowl, the greyhound and the poodle dog, who altogether deny that impressions can be made on species, and see in the long succession of extinct forms, the ancient existence of which they must acknowledge, the evidences of a continuous and Orderly sequence of conditions is followed by orderly organic changes. creative intervention, forget that mundane effects observe definite sequences, event following event in the necessity of the case, and thus constituting a chain, each link of which hangs on a preceding, and holds a succeeding one. Physical influences thus following one another, and bearing to each other the inter-relation of cause and effect, stand in their totality to the whole organic world as causes, it representing the effect, and the order of succession existing among them is perpetuated or embodied in it. Thus, in those ancient times to which we have referred, the sunlight acting on the leaves of plants disturbed the chemical constitution of the atmosphere, gave rise to the accumulation of a more energetic element therein, diminished the mechanical pressure, and changed the rate of evaporation from the sea, a series of events following one another so necessarily that we foresee their order, and, in their turn, making an impression on the vegetable and animal economy. The natural influences, thus varying in an orderly way, controlled botanical events, and made them change correspondingly. The orderly procedure of the one must be imitated in the orderly procedure of the other. And the same holds good in the animal kingdom; the recognized variation in the material conditions is copied in the organic effects, in vigour of motion, energy of life, intellectual power.

When, therefore, we notice such orderly successions, we must not at once assign them to a direct intervention, the issue of wise predeterminations of a voluntary agent; we must first satisfy ourselves how far they are dependent on mundane or material conditions, occurring in a definite and necessary series, ever bearing in mind the important principle that an orderly sequence of inorganic events necessarily involves an orderly and corresponding progression of organic life.

Universal control of physical agents over organisms.

To this doctrine of the control of physical agencies over organic forms I acknowledge no exception, not even in the case of man. The varied aspects he presents in different countries are the necessary consequences of those influences.

He who advocates the doctrine of the unity of the human race is plainly forced to the admission of the absolute control of such agents over the organization of man, since the originally-created type has been brought to exhibit very different aspects in different parts of the world, apparently in accordance with the climate and other purely material circumstances. To those circumstances it is scarcely necessary to add manner of life, for that itself The case of man. arises from them. The doctrine of unity demands as its essential postulate an admission of the paramount control of physical agents over the human aspect and organization, else how could it be that, proceeding from the same stock, all shades of complexion in the skin, and variety in the form of the skull, should have arisen? Experience assures us that these are changes assumed only by slow degrees, and not with abruptness; they come as a cumulative effect. They plainly enforce the doctrine that national type is not to be regarded as a definite or final thing, a seeming immobility in this particular being due to the attainment of a correspondence with the conditions to which the type is exposed. Let those conditions be changed, and it begins forthwith to change too. I repeat it, therefore, that he who receives the doctrine of the unity of the human race, must also accept, in view of the present state of humanity on various parts of the surface of our planet, its necessary postulate, the complete control of physical agents, whether natural, or arising artificially from the arts of civilization and the secular progress of nations toward a correspondence with the conditions to which they are exposed.

To the same conclusion also must he be brought who advocates the origin of different races from different centres. It comes to the same thing, whichever of those doctrines we adopt. Each brings us to the admission of the transitory nature of typical forms, to their transmutations and extinctions.

Human variations.

Variations in the aspect of men are best seen when an examination is made of nations arranged in a northerly and southerly direction; the result is such as would ensue to an emigrant passing slowly along a meridional track; but the case would be quite different if the movement were along a parallel of latitude. In this latter direction the variations of climate are far less marked, and depend much more on geographical than on astronomical causes. In emigrations of this kind there is never that rapid change of aspect, complexion, and intellectual power which must occur in the other. Thus, though the mean temperature of Europe increases from Poland to France, chiefly through the influence of the great Atlantic current transferring heat from the Gulf of Mexico and tropical ocean, that rise is far less than would be encountered on passing through the same distance to the south. By the arts of civilization man can much more easily avoid the difficulties arising from variations along a parallel of latitude than those upon a meridian, for the simple reason that in that case those variations are less.

Their political result.

But it is not only complexion, development of the brain, and, therefore, intellectual power, which are thus affected. With difference of climate there must be differences of manners and customs, that is, differences in the modes of civilization. These are facts which deserve our most serious attention, since such differences are inevitably connected with political results. If homogeneousness be an element of strength, an empire that lies east and west must be more powerful than one that lies north and south. I cannot but think that this was no inconsiderable cause of the greatness and permanence of Rome and that it lightened the task of the emperors, often hard enough, in government. There is a natural tendency to homogeneousness in the east and west direction, a tendency to diversity and antagonism in the north and south, and hence it is that government under the latter circumstances will always demand the highest grade of statesmanship.