Although organisation, on the whole, may have advanced and be still advancing throughout the world, yet the scale will always present many degrees of perfection; for the high advancement of certain whole classes, or of certain members of each class, does not at all necessarily lead to the extinction of those groups with which they do not enter into close competition.
Nahiz eta organizazioak, oro har, aurrera egin duen eta egun ere aurrera egiten ari den munduan zehar, eskalak hobekuntza gradu asko eskaintzen du; izan ere, zenbait klase osoren aurreramendu handiak, edo klaseko zenbait kiderenak, inola ere ez darama zuzenean lehian sartzen ez zaizkien taldeen iraungipenera.