TLEFT the world on my own impulse ; I was indeed heartily sick of it. Two things that are different cannot be forced to combine, just as buttermilk is for ever separate from butter. Both are produced by churning one substance, and different names are given to them. Chaff and grain are distinguished from each other by their properties. Tuka says. Where could a pearl ever find a dwelling place, if the mother-of-pearl were crushed ?