_Articulated animals._--Articulated animals (viz. insects, spiders, crustacees, etc.), compose the principal family of the animal kingdom; collections made in distant countries include generally a considerable proportion of new-varieties and the capture, preservation and transport of these little beings offer no serious difficulties. We recommend in a special manner to the attention of travellers enthomological researches; undertaken with zeal and intelligence, even by a person who is not a naturalist, they can not fail of being useful to science and important for the museum. In this, as in the other branches of zoology, it is not only the large and brilliant kinds which are more valued by the naturalist; generally it is, on the contrary, among the small insects or those of plain colors that the more novel forms are found; for collectors have ordinarily neglected them, and even in the best explored regions (in the environs of Paris, for example) are discovered varieties which, till now, have escaped attention. As for the manner of forming these collections and the particular indications relative to the classes into which is divided this vast division of the animal kingdom, and, consequently, we shall give to each of these groups a separate article. _Insects._--What we have said of articulated animals in general, is particularly applicable to insects, whose number is immense, and whose forms vary beyond all imagination. The kinds differ extremely from one country to another, often even from one locality to another, and it is rare to find perfect identity between insects which inhabit different regions, though often, at the first glance, no difference can be detected between them; besides, there is no point on the globe, where the enthomologic Faun is completly known, and although our museum has about eighty thousand kinds, our galleries do not include half that are seen in looking through the different collections of Europe. It results that, in all countries, travellers who occupy themselves with enthomology, can render themselves useful to the museum, and, in distant countries, they should not neglect collecting all the insects they find, even when the kinds do not appear to differ in anything from those found every day at home. There are some parts of the globe, which, enthomologically, deserve to fix the attention of the collecter, either by reason of their extraordinary richness or on account of the small number of parcels yet sent to the museum. Such are: the west part of Africa, from the gulf of Beninso the cape of good Hope; the Birman Empire, Assan, and even the interior of India, whence the English enthomologist receive so many remarkable varieties; Borneo, the Phillipines and the neighbouring isles; the western and northern part of Australia; the west coast of North America, from Mexico to Behring's strait, and the great basins of the Amazon.