"The American Mineralogist"

though Quetelet mentions this writer in his "Histoire des sciences math6matiques et physiques chez les Belges," and Jules Dewert and Modeste Soons have recently written upon his work, he is practically unknown to Eng- lish and American mathematicians.Born in 1508, dying probably about 1562, he claims to have been a professor of mathematics in Rome in 1546, and he certainly held such a chair in Ferrara in 1548.His works, eleven in num- ber, relate chiefly to the use of the sphere and the annulus, although some were purely astrological in their contents.