Program on essential oils to be held March 20 The origin of essential oils dates back thousands of years and is used quite extensively in many parts of the world for medicinal purposes.On March 20,Monmouth Medical Center will present,"An Introduction to theWorld of Essential Oils andAromatherapy"from 7:30-9 p.m.at the Tatum ParkActivity Center on Red Hill Road in Middletown. This course is designed as a basic introduction on how to integrate essential oils into daily life for healthy benefits.The program fee is $20 and preregistration is required by calling (732) 842-4000,ext.1.