Paper, 'The passive state of iron and steel. Part I' by Thomas Andrews Andrews writes: 'The singular metallurgical phenomenon of the passive state of iron presents many features of interest, affording a wide field for original research. The knowledge we possess on this peculiar and obscure subject is not, however, very extensive, owing possibly to the difficulties encountered in devising suitable methods of research in relation thereto. The author, therefore, approached the investigation with considerable diffidence, feeling greatly the difficulties accompanying a research of this intricate nature. He feels, however, rewarded by the measure of success which has ensued.' Annotations in pencil and ink. Subject: Metallurgy Received 18 May 1890. Read 5 June 1890. A version of this paper was published in volume 48 of the Proceedings of the Royal Society as 'The passive state of iron and steel.—Part I'. 1890