title: [Attempt at experimental demonstration of the biological activity of natural ionizing radiations].
mesh_terms: D000818:Animals; D006128:Growth / Q000528:radiation effects*; D010247:Paramecium / Q000528:radiation effects*; D013910:Thorium / Q000494:pharmacology*
chemical_list: D013910:Thorium
vernacular_title: Essai de démonstration expérimentale de lactivité biologique des radiations ionisantes naturelles.