Dedication signed: J. E. [i.e. John Eachard].

The letters (123 p. at end) have special title pages; each is "from T. B. [i.e. John Eachard; cf. British Museum, General cat. of printed books].

With this is bound the author's: Some opinions of Mr. Hobbs considered in a second dialogue ... London, 1673.

Part 2 has secondary signatures.

Each letter has special t.-p. & each is signed: T.B. [pseud.].