Pratishakhyas

Pratishakhyas (Sanskrit: प्रातिशाख्य pratiśākhya), collectively constituting four treatises, are the earliest of the Shikshas: works dealing with the phonetic aspects of the Sanskrit language used in Vedas. These works mainly pertain to euphonic permutation and combination of letters and special characteristics of their pronunciation as they prevailed in various schools of Vedic studies.

Rig Veda

One of the Pratisakhyas deal with the phonetic aspects of the Rig Veda. The work is generally ascribed to be written by Shaunaka, an ancient rishi (sage). It has been translated into German by Max Müller. A French translation done by M. Regnier is also available.

Yajur Veda

There are two treatises dealing with phonetic and related aspects of the Yajur Veda. The first, commonly known as the Krishna (Black) Yajur, is known as Taittriya Pratisakhya. Its translation done by Professor Whitney is also available, and the same has been published in the Journal of the American Oriental Society. The second treatise is commonly called the Shukla (White) Yajur, and is known as Vajasaneyi Pratisakhya. The later is believed to have been written by Katyayana. Its translation done by Weber is available.