The situation is aptly illustrated by a little book of 184 pages which is included in the first volume of the Tracts.  This work is specially noteworthy as one of the first English books to use the name ‘Unitarian,’ though the use is here so free and without apology or explanation that we must suppose it had already attained a certain vogue before 1687, the date of the book.  The title is A Brief History of the Unitarians, called also Socinians.  Neither author nor publisher is named, but the former is known to have been the Rev. Stephen Nye, a clergyman, whose grandfather, Philip Nye, was noted in his day as one of the few Independents in the Westminster Assembly.  Stephen Nye’s book takes the form of four Letters, ostensibly written to an unnamed correspondent who has asked for an account of the Unitarians, ’vulgarly called Socinians.’  The opening letter states their doctrine, after the model of Socinus—­God is One Person, not Three; the Lord Christ is the ‘Messenger, Servant, and Creature of God,’ also the ’Son of God, because he was begotten on the blessed Mary by the Spirit or Power of God’; ’the Holy Ghost or Spirit, according to them, is the Power and Inspiration of God.’ (We may notice here that Bidle, otherwise agreeing with Socinus, regarded the Holy Spirit as a living being, chief among angels.) Nye, writing as if an impartial observer, presents the Scripture argument in support of the doctrine of the Unitarians, ‘which,’ says he, ’I have so related as not to judge or rail of their persons, because however learned and reasonable men (which is their character among their worst adversaries) may be argued out of their errors, yet few will be swaggered or chode out of them.’  He traces the doctrine to the earliest Christian times, and shows the stages of Trinitarian growth.  Incidentally he says that Arian doctrines are openly professed in Transylvania and in some churches of the Netherlands, and adds that ‘Nazarene and Arian Churches are very numerous’ in Turkish, Mahometan, and pagan dominions where liberty of conscience is allowed.  He mentions celebrated scholars who have ’certainly been either Arians or Socinians, or great favourers of them,’ such as Erasmus, Grotius, Petavius, Episcopius, and Sandius—­the last-named a learned historian who had made a special point of collecting admissions by orthodox writers of the invalidity of all the texts in turn usually quoted in support of the Trinity.  In the subsequent chapters Nye deals seriatim with such texts, and the book ends with a commendation from ’A Gentleman, a Person of Excellent Learning and Worth,’ to whom the publisher had sent it for remark.