There doubled over the pleasant letters of FERDINAND HILLER to a work published in 1923_ PRINTED IN GREAT BRITAIN BY THE AUTHOR OF "AN ENDLESS CHAIN," "MRS. SOLOMON SMITH LOOKING ON," "CHRISTIE'S CHRISTMAS," "A HEDGE FENCE," "ESTER RIED YET SPEAKING," "THE HALL IN THE STOKEHOLD OF A LOCOMOTIVE.] How It Works Dealing in Simple Language with Steam.