In the beginning of January 1644, however, for reasons which are variously reported by himself and Clarendon, he resigned his governorship and commissions and went over to the parliament.
He was now recognized as one of the chief opponents of Clarendon and the High Anglican policy.
He appears to have taken no part in the attempt to impeach Clarendon on a general charge of treason.
His manual on Graphical Statics and his Elements of Projective Geometry (translated by C. Leudesdorf), have been published in English by the Clarendon Press.
She withdrew from the king's society, and in spite of Clarendon's attempts to moderate her resentment, declared she would return to Portugal rather than consent to a base compliance.