It is emphasized that, though the primary goal of an entomological museum is to serve as fundament for taxonomic research, new and important branches of entomology have added other duties. Studies in biogeography and in analyses of infraspecific variation require storing of virtually unlimited samples of the natural populations. And all information on the ecology of species, in form of journals, diaries, correspondence etc. of the collectors, should be carefully preserved and arranged so as to permit exact reference from the insect specimen. It is also a duty of the museum to initiate the preservation of base material used in, for instance, physiological and genetic research.