In any just estimate of the magnitude of the achievements of mankind in the three sub-periods of barbarism, they must be regarded as immense, not only in number and in intrinsic value, but also in the mental and moral development by which they were necessarily accompanied.
Ascending next through the prolonged period of savagery, let us strike out of human knowledge the organization into gentes, phratries and tribes; the syndyasmian family; the worship of the elements in its lowest form; syllabical language; the bow and arrow; stone and bone implements; cane and splint baskets; skin garments; the punaluan family; the organization upon the basis of sex; the village, consisting of clustered houses; boat craft, including the bark and dug-out canoe; the spear pointed with flint, and the war club; flint implements of the ruder kinds; the consanguine family; monosyllabical language; fetishism; cannibalism; a knowledge of the use of fire; and lastly, gesture language.[36] When this work of elimination has been done in the order in which these several acquisitions were made, we shall have approached quite near the infantile period of man's existence, when mankind were learning the use of fire, which rendered possible a fish subsistence and a change of habitat, and when they were attempting the formation of articulate language. In a condition so absolutely primitive, man is seen to be not only a child in the scale of humanity, but possessed of a brain into which not a thought or conception expressed by these institutions, inventions and discoveries had penetrated;--in a word, he stands at the bottom of the scale, but potentially all he has since become.
With the production of inventions and discoveries, and with the growth of institutions, the human mind necessarily grew and expanded; and we are led to recognize a gradual enlargement of the brain itself, particularly of the cerebral portion. The slowness of this mental growth was inevitable, in the period of savagery, from the extreme difficulty of compassing the simplest invention out of nothing, or with next to nothing to assist mental effort; and of discovering any substance or force in nature available in such a rude condition of life. It was not less difficult to organize the simplest form of society out of such savage and intractable materials. The first inventions and the first social organizations were doubtless the hardest to achieve, and were consequently separated from each other by the longest intervals of time. A striking illustration is found in the successive forms of the family. In this law of progress, which works in a geometrical ratio, a sufficient explanation is found of the prolonged duration of the period of savagery.