BULLIALDUS (the Latinized form of BOULLIAU, or BOULLAUD), ISMAEL, an eminent astronomer, born at Loudun in France in 1605. He travelled in his youth for the sake of improvement; and afterwards published several works, among which are the following, viz.:
1. De Natura Luceis, 1638, 8vo; 2. Philolusus, 1639, 4to; 3. Astronomia Philolaica, opus novum, in quo motus planetarum per novam et veram hypothesis demonstratur, Loudun, 1645, folio; 4. Astronomia Philolaica Fundamenta claris explicata et asserta adversus Zethi Wardi impugnationem, 1657, 4to; 5. De Lineis Spiralibus Demonstrationes, 1657, 4to; 6. Ad Astronomos Monita duo, 1657; 7. Ptolemæi Tractatus de Judicandi Facultate, 1657, 4to; 8. Opus Novum ad Arithmeticeam Infinitorum, 1682, folio.
Afterwards he became a presbyter at Paris, and died there in 1694.