248 ON NATURAL HISTORY MUSEUMS. pretensions to scientific education. Who, with a healthy spirit of inquiry, does not care to learn something about the sources and mode of preparation of those vegetable substances which are used as articles of food or of medicine, as materials for textile industries, or for constructive art ? The admirable Museum of Economic Botany at Kew attained, under Sir J. Hooker, to a state not far removed from perfection; and thus offers a model which other museums might seek to imitate in humble measure. But an immense amount of information can be imparted to an intelligent visitor by the exhibi- tion of a very unambitious collection, got together with comparative ease and at moderate cost. The strictly scientific portion of the botanical department would of course be represented by an Herbarium, which ought to contain a complete illustration of the Flora of [Essex], But a well- filled Herbarium, though valuable to the student who wishes to con- sult a typical collection, scarcely forms a feature in a public museum ; and the dried specimens hidden in their cabinet appeal but little to the ordinary visitor. To give, however, a popular insight into plant- structure, a few large sectional models might be advantageously ex- hibited in the general collection. Thus, the flower of a buttercup and a rose, a dandelion and the oak, would illustrate respectively the large divisions of thalamifloral and calycifioral, monopetalous and apetalous exogens ; whilst a lily and a grass might severally repre- sent the petaloid and glumaceous groups of endogens. The larger divisions of the flowering plants being thus represented, it would remain for a few models and diagrams to convey some general notions of Cryptogamic structure. The display of diagrams, or large drawings, should indeed be encouraged in all departments ; and an intelligent curator will thus utilise every foot of wall-space. Where resources are not limited, an attempt should be made to illustrate the local flora by a collection of living specimens. A botanical garden becomes, in fact, as valuable an adjunct to the vegetable department as an aquarium to the animal department; but there are few museums in this country so fortunately situated as to secure such an association. Turning to the mineral section of our typical museum, it is neces- sary to somewhat expand our view. For, in order to give anything like a fair notion of the mineral kingdom, it is absolutely necessary to exhibit a tolerably large series of the more commonly occurring species. Especial attention should of course be paid to those