In 1591 he was at Frankfort, and published three important metaphysical works, De Triplici Minimo et Mensura; De Monade, Numero, et Figura; De Immenso et Innumerabilibus.
Ita Cornua Ammonis, quae ex nautilorum numero habeantur, passim et forma et magnitudine (nam et pedali diametro aliquando reperiuntur) ab omnibus illis naturis discrepare dicunt, quas praebet mare.
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He wrote a paper Analysis per Equationes Numero Terminorum Infinitas, which he put, probably in June 1669, into the hands of Isaac Barrow (then Lucasian professor of mathematics), at the same time giving him permission to communicate the contents to their common friend John Collins (1624-1683), a mathematician of no mean order.