THREE OFFPRINTS AND ONE ENTIRE ISSUE OF AMBIX: 1) ON THOS. COCHRANE'S MS. NOTES OF BLACK'S CHEMICAL LECTURES, 1767-8. 2) THE EIGHTEENTH-CENTURY REVOLUTION IN CHEMISTRY. 3) ON FIVE HITHERTO UNRECORDED COPIES OF JEAN REY'S ESSAYS OF 1630. 4) SOME EARLY WORK