MS versions of various parts of published prefaces to 'Medicinal Experiments', and also related, unpublished material. (i) Fols. 91v-3: Vol. II, `Author's Preface', paragraph 3, nearly as printed; (ii) Fol. 93v: Vol. I, `Author's Preface', related to paragraph 3; cf. 1688 edition, `Advertisements', paragraph II, but MS postdates that edition; (iii) Fols. 94v-7: Vol. II, `Author's Preface', paragraph 2, as printed; (iv) Fols. 97v-8: Unpublished paragraph, apparently intended for Vol. II, `Author's Preface'; (v) Fols. 98v-9: Vol. II, `Author's Preface', paragraph 4, as printed; (vi) Fols. 99v-101: Vol. II, `Author's Preface', paragraph 1, as printed; (vii) Fols. 103v-5: Unpublished passage, explaining why he has not hesitated to include Galenic medicines in his collection.\r\nHand: Bacon,Greg (105v), correc by Greg. c 1690