 This proposition is particularized with respect to Bismarck, but direct and thus singular only with respect to the occurrent sense datum being demonstratively referred to. Finally, contrast this judgment with someone who has never perceived Bismarck but has only heard about him indirectly. Such agents cannot relate Bismarck directly to their sense data because, unlike Wilhelm, none of their sense data are caused by Bismarck's body. Hence, they must either think of him purely qualitatively — as, say, the first Chancellor of the German Empire, treating the German Empire as if it were a purely qualitative condition — or more indirectly, as the person written about in the books causing these sense data, thought standing in front of the books that are the source of the agents' thoughts about Bismarck. 