30 / CHRONICLESnCOMMENDABLESnCompanion tonColeridgenby Andrew ShaughnessynA Portrait of Charles Lamb by DavidnCecil, New York: Charles Scribnei'snSons; $19.95.nIn graceful prose not unworthy of hisnsubject, the distinguished English biographernLord David Cecil paints an endearingnportrait of "St. Charles," asnThackeray was later to call Lamb. Saintnhe was, certainly, and sinner, too. Thendeath . . .