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4S more striking. It shows, within its wooden case, the pince-nez that became one of his personal trademarks. Another was his motor-bike. All in all, he cut the kind of eccentric professorial figure that is much prized in certain universities. Early in life he developed a love of the outdoors, exploring the Alps in the Victorian fashion, and everywhere stooping to collect minerals. Many of his instruments were for the analysis ofsuch specimens. For example, the meldometer consisted essentially of a platinum strip upon which small crystals could be placed, electrically heated and viewed, in order to determine their precise melting points. Such interests drew him towards geology and he became professor of that subject. Joly brought to geology a keen appreciation of the importance of the exciting new subject of radioactivity and nuclear physics, and he explored its implications over two decades of research, expressed in several books. In particular, he was the first to correctly interpret pleochroic haloes, strange circular patterns in rocks such as mica. In three dimensions they are spherical. They are due to the decay of emitted alpha particles, whose lifetimes dictate their ranges in the material and hence radius of each circle. These radii can thus be identified with the radioactive isotope responsible for the emission. Some of the data defeated immediate categorisation, and Joly thought that he had discovered a new element. This was to be named Hibernium. Alas, it turned out to be Samarium, and Ireland remains unrepresented in the periodic table of the elements. Pleochroic haloes are

The parrot, the pince-nez and the pleochroic halo