Further, our student must submit to a thorough grounding in world-geography with its physical and human sides welded firmly together. He must be able to pick out on the map the headquarters of all the more notable peoples, not merely as they are now, but also as they were at various outstanding moments of the past. His next business is to master the main facts about the natural conditions to which each people is subjected--the climate, the conformation of land and sea, the animals and plants. From here it is but a step to the economic life--the food-supply, the clothing, the dwelling-places, the principal occupations, the implements of labour. A selected list of books of travel must be consulted. No less important is it to work steadily through the show-cases of a good ethnological museum. Nor will it suffice to have surveyed the world by regions. The communications between regions--the migrations and conquests, the trading and the borrowing of customs--must be traced and accounted for. Finally, on the basis of their distribution, which the learner must chart out for himself on blank maps of the world, the chief varieties of the useful arts and appliances of man can be followed from stage to stage of their development. Of the special studies concerned with man the next in order might seem to be that which deals with the various forms of human society; since, in a sense, social organization must depend directly on material circumstances. In another and perhaps a deeper sense, however, the prime condition of true sociality is something else, namely, the exclusively human gift of articulate speech. To what extent, then, must our novice pay attention to the history of language? Speculation about its far-off origins is now-a-days rather out of fashion. Moreover, language is no longer supposed to provide, by itself at any rate, and apart from other clues, a key to the endless riddles of racial descent. What is most needed, then, is rather some elementary instruction concerning the organic connection between language and thought, and concerning their joint development as viewed against the background of the general development of society. And, just as words and thoughts are essentially symbols, so there are also gesture-symbols and written symbols, whilst again another set of symbols is in use for counting. All these pre-requisites of human intercourse may be conveniently taken together.