The word, 'Psychology' is derived from two Greek words, 'Psyche' and 'Logos'. Psyche means 'Soul' and 'Logos' means 'Science'. Thus psychology was first defined as the 'Science of Soul". According to earlier psychologists, the function of psychology was to study the nature, origin and destiny of the human soul. But soul is something metaphysical. It cannot be seen, observed and touched and we cannot make scientific experiments on soul. In the 18th century, psychology was understood as the 'Science of Mind'. William James (1892) defined psychology as the science of mental processes. But the word "mind" is also quite ambiguous as there was confusion regarding the nature and functions of mind.
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