Dr. Schäfer sees this and points it out very clearly in his Presidential Address.[80] A scientific account of the origin of life must refer it to causes operating to-day; so, instead of Arrhenius' eternity of life, or of Pearson's spontaneous production of life but once under inaccessible conditions, or Lord Kelvin's meteoric conveyance of life, he believes that life is constantly being produced, and has always been produced, from certain colloidal substances which he describes. But what has become of all this life, constantly generated? He admits there is trace of only one paleontological series. While assuming that it is the nature of life to evolve, he admits that there is no evidence accessible to the senses or discerned as yet by the most delicate instruments for the existence of these countless beginnings of life. The real question then concerns not this kind of life, which eye hath not seen, but the origin of the life which we know, and whose marvellous development evolution traces. Ostwald thinks that "it is undecided whether originally there were one or several forms from which the present forms sprang, nor is it known how life first made its appearance on earth. So long as the various assumptions with regard to this question have not led to decisive, actually demonstrable differences in the results, a discussion of it is fruitless, and therefore unscientific."[81] 80: _Science_, September 6, 1912, pp. 294 ff. 81: "Natural Philosophy," p. 175. A comparison has often been drawn between the birth of the individual and that of the race. Theologians have discussed the question whether the child in his spiritual nature is to be referred to a special act of creative power, or whether all of his endowments are derived from his parents. To the poet the birth of the child suggests the presence of forces other than those of the seen and temporal. The new life is "out of the deep, from the true world, within the world we see." Its roots are in another dimension of being than that of nature or the world of time and sense. In moments of insight, "though inland far we be, our souls have sight of that immortal sea which brought us hither." Again to the philosopher there is in the individual something indescribable, unique, not to be compressed within the compass of any general law, something in each individual which his ancestry or antecedents will not explain nor his environment produce.[82] 82: See Royce: "The World and the Individual," II, p. 325.