No one who has lived in the Colony for years could sketch the real moral portrait of such a remarkable combination of virtues and vices. The domesticated native's character is a succession of surprises. The experience of each year modifies one's conclusions, and the most exact definition of such an inscrutable being is, after all, hypothetical. However, to a certain degree, the characteristic indolence of these Islanders is less dependent on themselves than on natural law, for the physical conditions surrounding them undoubtedly tend to arrest their vigour of motion, energy of life, and intellectual power. The organic elements of the European differ widely from those of the Philippine native, and each, for his own durability, requires his own special environment. The half-breed partakes of both organisms, but has the natural environment of the one. Sometimes artificial means--the mode of life into which he is forced by his European parent--will counteract in a measure natural law, but, left to himself, the tendency will ever be towards an assimilation to the native. Original national characteristics disappear in an exotic climate, and, in the course of time, conform to the new laws of nature to which they are exposed. It is an ascertained fact that the increase of energy introduced into the Philippine native by blood mixture from Europe lasts only to the second generation, whilst the effect remains for several generations when there is a similarity of natural surroundings in the two races crossed. Moreover, the peculiar physique of a Chinese or Japanese progenitor is preserved in succeeding generations, long after the Spanish descendant has merged into the conditions of his environment. The Spanish Government strove in vain against natural law to counteract physical conditions by favouring mixed marriages, [79] but Nature overcomes man's law, and climatic influence forces its conditions on the half-breed. Indeed, were it not for new supplies of extraneous blood infusion, European characteristics would, in time, become indiscernible among the masses. Even on Europeans themselves, in defiance of their own volition, the new physical conditions and the influence of climate on their mental and physical organisms are perceptible after two or three decades of years' residence in the mid-tropics.