Answer:
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.
Brown I am and much admired; many horses have I tried; tire a horse and worry a man; tell me this riddle if you can.
My first is twice in apple but not once in tart. My second is in liver but not in heart. My third is in giant and also in ghost. Whole I’m best when I am roast.
You get many of me, but never enough. After the last one, your life soon will snuff. You may have one of me but one day a year, When the last one is gone, your life disappears.
What loses its head in the morning and gets it back at night?
What covers its face with its hands, speaks no language, yet most known what it's saying?