Van Rheede was also assisted by the King of Cochin and the ruling Zamorin of Calicut. Prominent among the Indian contributors was the Ezhava physician Itti Achuden, a "Thiyya Vaidyan" of the Mouton Coast of Malabar whose contribution was examined by three Brahmins named Ranga Bhat, Vinayaka Pandit and Appu Bhat. The ethnomedical original information in the work was provided by Itti Achuden and the three Brahmins, working on it for two continuous years morning and evening. Their certificate to this effect is given in the first volume of the book. A grand memorial to them is erected in Kochi.