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The motion of a wave packet moving in a potential well with a penetrable barrier is considered. A formally exact expression for the evolution operator is given as a sum over quasistationary energy eigenfunctions plus a remainder term. Numerical calculations are carried out for the square barrier potential. The approximation in which one neglects the remainder term is shown to be a useful and accurate one in computing properties of the particle which depend on the value of the wavefunction inside the potential well.

Das Auftreten von Komplikationen wahrend und nach operativen Eingriffen last sich trotz Verbesserung der Anaesthesiemethoden nicht sicher ausschliesen. Die Auswertung von rund 30 000 Narkoseprotokollen des eigenen Institutes erbrachte, das Herzrhythmusstorungen im intra- und postoperativen Verlauf als Komplikation in ihrer Haufigkeit hinter den Hypotensionen an zweiter Stelle liegen. Im wesentlichen sind Tachyarrhythmien, Extrasystolien und Uberleitungsstorungen zu nennen.

ROENTGENOGRAMS of the wrists of children taken casually during the past few years, in private practice, have revealed such a large number of unsuspected conditions that the procedure has now been established as routine. There are a number of pathologic entities in children the existence of which can frequently be readily detected or suggested by roentgenograms of the wrists. Of these, some may be discovered at their incipience, while in others, which are in advanced or clinically obscure stages, focus may be brought for the first time on the underlying cause by the use of this procedure. The distal ends of the ulna and radius are the optimal sites for the demonstration of the earliest rachitic lesions by roentgenogram. All of the metaphysial changes of scurvy appear earliest and are most marked at the sites of most rapid growth and most active endochondral bone formation, among which are the distal