17. I have mentioned this here, because I think we cannot be too cautious that words and species, in the ordinary notions which we have been used to of them, impose not on us.
17. Hau hemen aipatu badut, hauxe uste dudalako izan da, alegia, ezin dezakegula kontu handiegirik hartu, hitzek eta espezieek, erabiltzen ohiturik gauden euren nozioetan, gaina hartu diezaguten galarazteko.