William Dwight Whitney,
Sanskrit Grammar
(This republication 1950, original 1889)
“ Whatever, namely, may have been originally and strictly the mode of production of the derivatives with prefixes, it is throughout the recorded life of the language as if the root and its prefix or prefixes constituted a unity, from which a derivative is formed in the same manner as from the simple root, with that modification of the radical meaning which appears also in the proper verbal forms as compounded with the same prefixes. ”
