Now let us understand clearly what we mean by a subtle body. It is nothing but a minute germ of a living substance. It contains the invisible particles of matter which are held together by vital force, and it also possesses mind or thought-force in a potential state, just as the seed of a plant contains in it the life force and the power of growth. According to Vedanta, the subtle body consists of _Antahkaranam_, that is, the internal organ or the mind substance with its various modifications, mind, intellect, egoism, memory, the five instruments of perception: the powers of seeing, hearing, smelling, tasting and touching; the five instruments of action, such as the powers of seizing, moving, speaking, evacuating, and generating, and the five _Prânas. Prâna_ is a Sanskrit word which means vital energy or the life-sustaining power in us. Although _Prâna_ is one, it takes five different names on account of the five different functions it performs. This word _Prâna_ includes the five manifestations of the vital force: First, that power which moves the lungs and draws the atmospheric air from outside into the system. This is also called _Prâna_. Second, that power which throws out of the system such things as are not wanted. It is called in Sanskrit _Apâna_. Third, it takes the name of _Samâna_, as performing digestive functions and carrying the extract of food to every part of the body. It is called _Udâna_ when it is the cause of bringing down food from the mouth through the alimentary canal to the stomach, and also when it is the cause of the power of speech. The fifth power of _Prâna_ is that which works in every part of the nervous system from head to foot, through every canal, which keeps the shape of the body, preserves it from putrefaction, and gives health and life to every cell and organ. These are the various manifestations of the vital force or _Prâna_. These subtle powers together with the non-composite elements of the gross body, or the ethereal particles of subtle matter, and also with the potentialities of all the impressions, ideas and tendencies which each individual gathers in one life, make up his subtle body. As a resultant of all the different actions of mind and body which an individual performs in his present life, will be the tendencies and desires in his future life; nothing will be lost. Every action of body or mind which we do, every thought which we think, becomes fine, and is stored up in the form of a _Samskâra_ or impression in our minds. It remains latent for some time, and then it rises up in the form of a mental wave and produces new desires. These desires are called in Vedanta, _Vâsanâs_. Vâsanâs or strong desires are the manufacturers of new bodies. If Vâsanâ or longing for worldly pleasures and objects remains in anybody, even after hundreds of births, that person will be born again. Nothing can prevent the course of strong desires. Desires must be fulfilled sooner or later.