Teach me how to eat, give me information on subjects with which you are acquainted, and I shall readily listen to you, hut do not pretend to instruct me in matters of which you have no knowlege, was said by Bacchus to Hercules, who was laying down rules for the construction of tragedies and other poems: Hercules being as famed for the voraciousness of his appetite, as for his great bodily strength.