Let's shorten this sentence a bit: "...dass die Natur den Weibern [...] ein treffenderes Urteil [...] verliehen hat als unsern Landsmänninnen." I understand you're not sure what the relationship of "Natur" and "Weiber" in this context is, so the part you're looking for is "den Weibern", which is dative plural of "die Weiber" (https://www.verbformen.de/deklination/substantive/Weib.htm). You could turn this into a question "Wem hat die Natur ein treffenderes Urteil..." Answer "Den Weibern" In other words the nature in this context did something to the women, it "hat ein treffenderes Urteil verliehen" - made them a better judge. If this sentence was meant to say "the nature...the women...", it would be like this: ...dass die Natur der Weiber [...] ein treffenderes Urteil [...] verliehen hat als unsern Landsmänninnen. I have a hard time to make sense of that sentence as a whole, but I can see where you're coming from. In thise case it would be "der Weiber", which is genitive plural of "die Weiber". The question would now be "Wessen Natur..." Answer "Die Natur der Weiber" One more thing about context: I don't know where this text comes from but the choice of words indicates it's pretty old and sounds a bit off today. You wouldn't say "Weiber" in a modern text, it has now a bit of a negative connotation. "Frauen" would be the preferred term.