Metre in Sanskrit has a long history from the time of Vedas themselves. Most of the classical metres have developed from the Vedic metres. The folk tradition of India has also influenced much in the various stages of the development of the classical metres in Sanskrit. Prosodists generally accept that the classical metres are the Prastaras (permutations) of various Vedic metres like Gayatri, Usnik, Brhatt and Tristubh. Each metre is having a number of Prastaras among which only very few are accepted and used by poets generally. Thus Anustubh has 256 Prastaras all of which are illustrated by the scholar poet Ramapanivada in a short poem Rasakrida appended to his famous work on Prosody, Vrttavartika. This is a unique feature of Vrttavartika as a work on Prosody. The present book is a study on the metre in Sanskrit with special reference to Vrttavartika of Ramapanivada studying in detail the rhythmic patterns of the Prastaras of Anustubh exemplified by the author in Rasakrida.