The primitive races of mankind first employed the sign language, and spoken words. After that comes picture language, and lastly the language of written words. Among the Indians and frontiersmen of the western United States and Canada, the sign language has reached what in all probability is its highest development, and its vocabulary is really wonderful. The higher wild animals express their thoughts and feelings usually by sign language, and rarely by vocal sounds. Their power of expression varies species by species, or tribe by tribe, quite as it does among the races and tribes of men. It is our belief that there are today several living races of men whose vocabularies are limited to about 300 words. Very many species of animals appear to be voiceless; but it is hazardous to attempt to specify the species. Sometimes under stress of new emergencies, or great pain, animals that have been considered voiceless suddenly give tongue. That hundreds of species of mammals and birds use their voices in promoting movements for their safety, there is no room to doubt. The only question is of the methods and the extent of voice used. Birds and men give expression to their pleasure or joy by singing. In the jungle and the heavily wooded wilderness, one hears really little of vocal wild-animal language. Through countless generations the noisiest animals have been the first ones to be sought out and killed by their enemies, and only the more silent species have survived. All the higher animals, as we call the higher vertebrates, have the ability to exchange thoughts and convey ideas; and that is language. At the threshold of this subject we are met by two interesting facts. Excepting the song-birds, the wild creatures of today have learned through instinct and accumulated experience that silence promotes peace and long life. The bull moose who bawls through a mile of forest, and the bull elk who bugles not wisely but too well, soon find their heads hanging in some sportsman's dining- room, while the silent Virginia deer, like the brook, goes on forever. Association with man through countless generations has taught domestic animals not only the fact of their safety when giving voice, but also that very often there is great virtue in a vigorous outcry. With an insistent staccato neigh, the hungry horse jars the dull brain of its laggard master, and prompts him to "feed and water the stock." But how different is the cry of a lost horse, which calls for rescue. It cannot be imitated in printed words; but every plainsman knows the shrill and prolonged trumpet-call of distress that can be heard a mile or more, understandingly. And think of the vocabulary of the domestic chicken! Years of life in fancied security have developed a highly useful vocabulary of language calls and cries. The most important, and the best known, are the following: