ऋजुस्वभावसंस्थानं प्राकृतं तु स्वभावजम् । मंगल्याध्ययनध्यानस्वभावजयकर्मसु ॥ ३७॥
Besides these there are many other gestures of the head, which are based on popular acting. These are to be used according to the popular practice (lit. nature).
english translation