But the boundary line of what, like elephant, oak, gold, is markedly distinctive, the line of demarcation of what is genus and species passes through many stages into the endless particularization of the chaos of plants and animals, kinds of rocks, or of metals, forms of earth, etc., etc., that only force and craft can bring to light.
Baina elefantea, haritza, urrea bereizten dituen muga, generoaren eta espeziearen arteko muga, maila askotatik igarotzen da abere eta landare kaotikoen, mendikate moten edo bortxa eta teknikaren bidez soilik agerrarazi daitezkeen metal, lur eta abarren banaketa amaigabean.