These are the primary Accession-Collections that came to the British Museum, during the first seventy years which elapsed after its public opening (January, 1759). They form a noble monument alike of the liberality and public spirit of individual Englishmen, and of the fidelity of the Trustees to the charge committed to them as a body. And the reader will hardly have failed to notice how remarkable a proportion of the most munificent of the Benefactors of the institution were, previously to their gifts, numbered amongst its Trustees. If the liberality of Parliament failed to be elicited in due correspondency—in respect either to the amount or the frequency of its grants—to that of individuals, the failure is rarely, if ever, ascribable to oversight or somnolency on the part of the Trustees. If, during the lapse of those seventy years, they obtained grants of public money which amounted, in the aggregate, to but £151,762—little more, on an average, than two thousand pounds a year—they made not a few applications to which the Treasury, or the House of Commons, refused to respond. Meanwhile, the gifts of Benefactors probably much more than trebled the public grants. At the outset, the Museum was divided into three ‘Departments’ only: (1) _Manuscripts_; (2) _Printed Books_; (3) _Natural History_. The acquisition, in 1801, of the Alexandrian monuments, was the first accession which gave prominence to the ‘Antiquities’—theretofore regarded as little more than a curious appendage to the Natural History Collections. Four years later came the Townley Marbles. It was then obvious that a new Department ought to be made. This change was effected in 1807. The Marbles and minor Antiquities, together with the Prints, Drawings, Coins, and Medals (formerly appended to the Departments of Printed Books and of MSS.) were formed into a separate department. Twenty years afterwards the ‘Botanical Department’ was created, on the reception of the Banksian herbaria and their appendant Collections. The division into five departments continued down to the date of the Parliamentary inquiry of 1835–36 [Book III, Chapter 1]. Soon afterwards (1837), the immediate custody of the ‘Prints and Drawings’ was severed from that of the ‘Antiquities’ and made a special charge. In like manner, the Department of ‘Natural History’ was also (1837) subdivided; but in this instance the one department became, eventually, three: (1) Zoology; (2) Palæontology; (3) Mineralogy. The two last-named divisions were first separated in 1857. How the eight departments of 1860 have become _twelve_ in 1869 will be seen hereafter. It will also, I think, become apparent that this subdivision of Departments has contributed, in an important measure, to the enlargement of the several Collections; as well as to their better arrangement, and to other exigencies of the public service.