(William), an eminent mathematician, was born at Eton in 1573, and educated in the school there, whence he was elected to king's college in Cambridge, of which he afterwards became fellow. Having received holy orders, he left the university about the year 1603, and was presented to the rectory of Aldbury, near Guildford in Surrey; and about the year 1628, was appointed by the earl of Arundel to instruct his son in the mathematics. He kept a correspondence by letters with some of the most eminent scholars of his time, upon mathematical subjects; and the most celebrated mathematicians of that age owed most of their skill to him, whose house was full of young gentlemen that came from all parts to receive his instruction. It is said, that, upon hearing the news of the vote at Westminster for the restoration of king Charles II, he expired in a sudden transport of joy, aged 88. He wrote, 1. Clavis Mathematica; which was afterwards published in English. 2. A description of the double horizontal dial. 3. Opuscula Mathematica; and several other works. He left also behind him a great number of papers upon mathematical subjects, which are now in the museum of William Jones, Esq.; F. R. S.