"Good-night, Martie," called a sweet voice down the stairway. "Good-night, Rose dear; I thought you were asleep." "Good-night, Martie," duetted the twins, in the shrillest of treble and falsetto. "Good-night, you rogues; go to sleep; you 'll wake baby." "Dood-night, mummy," chirped a little voice from the adjoining room. There was a shout of laughter from the twins.