altered. Another metrical work attributed to Çaunaka is the Ṛigvidhāna, which describes the magical effects produced by the recitation of hymns or single verses of the Rigveda.
To the Pariçishṭas of the Sāmaveda belong the two indices called Ārsha and Daivata, enumerating respectively the Rishis and deities of the text of the Naigeya branch of the Sāmaveda. They quote Yāska, Çaunaka, and Āçvalāyana among others. There are also two Anukramaṇīs attached to the Black Yajurveda. That of the Ātreya school consists of two parts, the first of which is in prose, and the second in çlokas. It contains little more than an enumeration of names referring to the contents of its Saṃhitā. The Anukramaṇī of the Chārāyaṇīya school of the Kāṭhaka is an index of the authors of the various sections and verses. Its statements regarding passages derived from the Rigveda differ much from those of the Sarvānukramaṇī of the Rigveda, giving a number of totally new names. It claims to be the work of Atri, who communicated it to Laugākshi. The Anukramaṇī of the White Yajurveda in the Mādhyaṃdina recension, attributed to Kātyāyana, consists of five sections. The first four are an index of authors, deities, and metres. The authors of verses taken from the Rigveda generally agree with those in the Sarvānukramaṇī. There are, however, a good many exceptions, several new names belonging to a later period, some even to that of the Çatapatha Brāhmaṇa. The fifth section gives a summary account of the metres occurring in the text. It is identical with the corresponding portion of the introduction to the Sarvānukramaṇī, which was probably the original position of the section. There are many other Pariçishṭas of the White Yajurveda, all attri-