In other words , having such and such essential properties is a necessary condition for membership in a given natural kind .
Scientific essentialism , a view espoused by Saul Kripke and Hilary Putnam , maintains that there exist essential properties that objects possess ( or instantiate ) necessarily .
Having such and such essential properties is a necessary condition for membership in a given natural kind .
Scientific essentialism , a view espoused by Saul Kripke and Hilary Putnam , maintains that there exist essential properties that objects possess ( or instantiate ) necessarily .