On this plane of the mind is found all of the vital functions and operations. The work is done out-of-consciousness, and the consciousness is aware of this part of the mind only when it makes demands upon the conscious for food, etc. On this plane also resides the elementary instinct that tends toward reproduction and sexual activity. The demand of this part of the mind is always "increase and multiply," and according to the stage of growth of the individual is the mandate carried out, as we shall see presently. The elementary impulses and desires that we find rising into the field of consciousness come from this plane of the mind. Hunger, thirst and the reproductive desires are its messages to the higher parts of the mind. And these messages are natural and free from the abuses and prostitution often observed attached to them by the intellect of man in connection with his unrestrained animal impulses. Gluttony and unnatural lust arise not from the primitive demand of this plane of the mind--for the lower animals even are free from them to a great extent--but it is reserved for man to so prostitute these primitive natural tendencies, in order to gratify unnatural and artificial appetites, which serve to frustrate nature rather than to aid her. As Life advanced in the scale and animal forms appeared on the scene new planes of mind were unfolded, in accordance to the necessity of the living forms. The animal was compelled to hunt for his food--to prey upon other forms, and to avoid being preyed upon by others. He was compelled to struggle for the unfoldment of latent powers of his mind that would give him means to play his part in the scheme of life. He was compelled to do certain things in order to live and reproduce his kind. And he demanded not in vain. For there came to him slowly an unfolding knowledge of the things necessary for the requirements of his life. We call this Instinct. But, pray remember, by Instinct we do not mean the still higher something that is really rudimentary Intellect that we notice in the higher animals. We are speaking now of the unreasoning instinct observed in the lower animals, and to a certain degree in man. This Instinctive plane of mentality causes the bird to build its nest before its eggs are laid, which instructs the animal mother how to care for its young when born, and after birth; which teaches the bee to construct its cell and to store up its honey. These and countless other things in animal life, and in the higher form of plant life, are manifestations of Instinct--that great plane of the mind. In fact, the greater part of the life of the animal is instinctive although the higher forms of animals have developed something like rudimentary Intellect or Reason, which enables them to meet new conditions where Intellect alone fails them.