The four collections of old Yajus texts, so far known to us, while differing more or less considerably in arrangement and verbal points, have the main mass of their textual matter in common. This common matter consists of both sacrificial prayers (yajus) in verse and prose, and exegetic or illustrative prose por tions (brahmana). A prominent feature of the old Yajus texts, as compared with the other Vedas, is the constant intermixture of textual and exegetic portions. The Charakas and Taittiriyas thus do not recognize the distinction between Samhita. and Brahmana in the sense of two separate collections of texts, but they have only a Sarnhita, or collection, which includes likewise the exegetic or Brahmana portions. The Taittiriyas seem at last to have been impressed with their want of a separate Brahmana and to have set about supplying the deficiency in rather an awkward fashion: instead of separating from each other the textual and exegetic portions of their Sarnhita, they merely added to the latter a sup plement (in three books), which shows the same mixed condition, and applied to it the title of Taittiriya-brahmana.
The Maitrciyani Samhitci, the identity of which with the original Kalapaka has been proved pretty conclusively by Dr. L. v.
Schroder, who attributes the change of name of the Kalapa Maitrayaniyas to Buddhist influences, consists of four books, attached to which is the Maitri- (or Maitrayani) upanishad. The Kathaka, on the other hand, consists of five parts, the last two of which, however, are perhaps later additions, containing merely the prayers of the hotar priest, and those used at the horse sacrifice. There is, moreover, the beautiful Katha- or Keithakct, upanishad, which is also, and more usually, ascribed to the Atharvaveda, and from which Sankhya-Yoga ideas may have developed.
The Vcijasaneyi-samhird consists of forty adhyayas, the first eighteen of which contain the formulas of the ordinary sacrifices.
The last fifteen (or even twenty-two) adhyayas are doubtless a later addition. The last adhyaya is commonly known under the title of V ajasaneyi-samhitd (or liavasya-) upanishad. Its object seems to be to point out the fruitlessness of mere works, and to insist on the necessity of man's acquiring a knowledge of the supreme spirit.
The last book is of the Upanishad order, and bears the special title of Brihad- (great) aranyaka; its last six chapters are the Brihadeiranyaka-upanishad, the most important of all Upanishads.
As regards the age of the gatapatha, the probability is that the main body of the work is considerably older than the time of Panini, but that some of its latter parts were considered by Panini's critic Katyayana to be of about the same age as, or not much older than, Panini.
The consolidation of the Brahmanical hierarchy and the institu tion of a common system of ritual worship, which called forth the liturgical Vedic collections, were doubtless consummated in the so-called Madhya-dega, or "midland," lying between the Sarasvati and the confluence of the Yamuna and Gafiga; and more especially in its western part, the Kuru–kshetra, or land of the Kurus, with the adjoining territory of the Pafichalas, between the Yamuna and Gafiga. From thence the original schools of
Vaidik ritualism gradually extended their sphere over the adjacent parts. The Charakas seem for a long time to have held sway in the western and north-western regions; while the Taittiriyas in course of time spread over the whole of the peninsula south of the Narmada (Nerbudda), where their ritual has remained pre eminently the object of study till comparatively recent times. The Vajasaneyins, on the other hand, having first gained a footing in the lands on the lower Ganges, chiefly, it would seem, through the patronage of King Janaka of Videha, thence gradually worked their way westwards, and eventually succeeded in superseding the older schools north of the Vindhya.