In addition to the series of rocks and fossils illustrating the stratigraphy and succession of the sedimentary rocks and the systematic collection of minerals and ores, an exhibit showing how geologic work benefits the daily life of the people should be developed. An illustration of this would be a representation of the artesian-water supply of the semi-arid region, showing the stratification and structure of the sedimentary rocks, and how hydrographic and geologic investigations clearly indicate the regions in which artesian-water development may be carried on successfully. Mining and areal geology could also be illustrated in such manner as to place before the student and intelligent observer the import and value of such work. In most museums the principal effort has been to make a collection of useful mineral products. This is desirable, but, from the broad view of illustrating the practical in addition to the scientific side of geology, it should be secondary. The best basis for classification on the practical side of the museum exhibit appears to be the finished mineral product. For instance, if pig iron be taken as a key material in classification, the iron ores from which it has been obtained should be arranged so as to show the various kinds whose combination has resulted in the pig iron. In connection with this should be grouped the geologic phenomena, which should include any geologic conditions connected with the original deposition and the occurrence of iron ores. This might include the conditions which have led to the oxidation of pyrite and other sulphur compounds of iron, and to the development of hydrous oxides of iron; also an illustration of what has been demonstrated in regard to the solution of widely distributed minerals in certain rocks, and their subsequent concentration in ore bodies by metasomatic action. All the metals could be arranged under such a classification, as also the nonmetallic products. The preparation of such an exhibit would require many years of work, the details of which would be considered as each mineral product was taken in hand. 4. The fourth direction of development is toward the requirements of a National University, which has already been sufficiently dwelt upon in this connection. CHILDREN'S MUSEUM.--The children gain a fair amount of information from the general exhibit in any well-arranged museum, but it is desirable that their interest should be aroused by having certain exhibits made expressly for them. I would have a space set aside in each of the three departments in which nothing should be exhibited except for the children. It might be called a Museum Kindergarten.