The ‘Charaka Samhita’ was written by Maharshi Charak. This book mentions over 2,000 medicinal herbs and their uses. Maharshi Sushrut mentioned about the instruments used in surgery in his book ‘Sushruta Samhita’. Vagbhatta wrote two books on medicine called the ‘Vagbhatta Samhita’ and the ‘Ashtang Hriday’.