8 Now, how can we account for these facts on any of the known data on which we have at present to rely ? In my opinion, we shall have to go far deeper down than we have been able to go by any present means of observation--to the corpuscles, atoms, electrons, or whatever else there may be; and we shall find these subjected to subtle influences of mind and body during their formations and combinations, of which we hardly realize the importance. I believe that in these potent factors the solution of the problem may be found why one member of a family rises above others, and others do not rise above the ordinary level, but perhaps sink below it. To me it seems, when I consider this matter in regard to these difficulties, that in making a comparison with the improvement of breeding of animal stock we may be apt to be misled. We are all organic machines, so to speak; at the same time, when we come to the human being there are complexities which arise from the mental state and its moods and passions which entirely disturb our conclusions, which we should be able to form in regard to the comparatively simple machines which animals are.