During his time at the University of North Carolina, Baskerville experimented with thorium and published his results in 1901.
[1] He reported having separated thorium into three fractions with slightly different chemical properties: the known thorium and two new elements, carolinium (symbol Cn) and berzelium (symbol Bz).
The names derived from two sources: As a response to the publication Bohuslav Brauner claimed that he already stated the fact that thorium should be a mixture of several elements.
[3] In 1905, R. J. Meyer and A. Gumperz failed to replicate the results, and showed that thorium is only one element and not a mixture.
[4] H. G. Wells's 1914 novel The World Set Free features an atomic bomb based on the similarly named "Carolinum".