The Age of the Samhitas
The systematic and codified knowledge of Āyurveda attained maturity in the classical texts of the samhitas. They are several texts and each of them is attached to the name of an ācārya, preceptor, such as Caraka, Suśruta, Bhela, Kāśyapa, and Hārīta. The knowledge and wisdom of indigenous healing and healthcare are explained in the samhitas with special references to a particular branch of the system of medicine. Thus kāyacikitsa, general medicine, is the subject of the Carakasamhita while śalyacikitsa, surgery, is the subject of the Suśrutasamhita. Bhēḷasamhita deals mainly with diseases and treatments for the mind, Kāśyapasamhita focuses on koumārabhṛtya, pediatrics, and the subject of the Hārītasamhita is gṛhabādha, demonology, and allied matters. What were preserved in preceding literature including the Vedas, the Brāhmaņas, and the Buddhist Pali canonical texts as seeds and seedlings are found fully grown in the samhitas, nourished by scholarly discussions at various levels. The indigenous medical system was designated as Āyurveda by the time of the samhitas. Topics such as qualities of a preceptor, qualities of a disciple, and qualities of the science are discussed in the various samhitas. Initiation of the disciples, knowledge of anatomy, procedure of treatment, and Modalities of treatment are discussed in great detail. The traditional method of the daivavyapāśraya (the divine or magico-religious) mode of treatment of the Vedic tradition was replaced by the yuktivyapāśraya (empirico-rational) method of therapy with the codification of the Carakasamhita. The emphasis of Caraka was on the process of investigation, which is essential for arriving at scientific truth and hence he repeatedly uses the word parīkṣa instead of pramāṇa.