16(A) unknown philosophical principle employed in rotation of crop (4) O?A?
19(A) Is necessary for new work to turn to fiction (4,4) L?E?U?O?
any help appreciated
16a oyat ?, unknown = y, philosophical principle = tao
oyat is a french word for a plant used for stabilising (?) sand dunes http://fr.thefreedictionary.com/oyat - but it's in a french dictionary which makes me doubtful