Enough has been said to show that animals have and do exercise powers of reason. That they have the means of transmitting ideas to their fellows is not to be questioned. Language is the means of transmission. Not only are they able to interchange thoughts with each other, but with man also when they are brought into contact with him. They must possess a language of some kind, whereby they can understand each other, can comprehend human language, and make themselves intelligible to man. All these conditions are fulfilled in the lower animals, but there is one distinction between the capability of understanding their own language and that of man, and that is, that they are born with the one and have to learn the other. Newly-hatched chickens, although they have only entered the world an hour or so ago, understand perfectly well their mother. They know what to do when she calls them to find what food she has unearthed, and they know what to do when she warns them of danger. Who has not heard them talk to her? But how different are their tones under various circumstances. The little piping notes of content when all is going on well can never be confounded with the cry of alarm when they have lost their way or are otherwise frightened. Wasps, as everybody knows who has studied these insects, carry out one of the first principles of military art. They always have the gate of their fortress guarded by a sentinel. Should danger be imminent, the alarm is given by the sentinel, and out rush the inhabitants to wreak vengeance upon the offender. Out of a full-sized nest, consisting of many hundred wasps, it is evident that the individual who is to act as sentinel must be selected, and its task appointed. How the selection is made, no one knows. But that such is done, there can be no question, for the rest of the community acknowledge their sentinel, trust to it for guarding the approaches of the nest, while they busy themselves with the usual task of collecting food for the young and new material for the nest.