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Das Aspekt-und Zeitproblem im Slavischen.Hans Christian Søorensen: Aspect et temps en slave (Institut Slave de l'Universite d'Aarhus). Århus 1949, pp. 1-188.Kristine Netteberg: Etudes sur le verbe polonais Kopenhagen 1953.Urslavische and altrussische Lantentwicklung.Birger Calleman: Zu den Haupttendenzen der urslavischen und altrussischen Lautentwicklung (Publications de l'Institut slave d'Upsal III), Uppsala 1950, 174 S.Der russische Akzent.[image omitted] = Supplement du No 1 de l'Annuaire de l'Institut Finlandais d'Etudes Sovietiques Helsinki 1950, 123 Seiten.Altrussische Texte.Staffan Dahl: Codex Ad 10 der Vasteråser Gymnasialbibliothek (Publications de l'Institut slave d'Upsal II), Uppsala 1949. 168 S.Edvin Ohgren: Die Udo-Legende.—Ihre Quellen und Verbreitung mit besonderer Berucksichtigung ihrer Ubersetzung ins Russisch-Kirchenslavische (Publications de l'Institut slave d'Upsal VIII). Uppsala 1954, 160 S.[image omitted]Carl Stief: Studies in the Russian Historical Song[image omitted] 1953.Altpolnische Syntax.Eino Nieminen: Beitrage zur altpolnischen Syntax I, II (Annales Academiæ scienliarum Fennicæ Ser. B, T.43: 3, 63: 4), Helsinki 1939-50.History of Old Russian Literature.Ad. Stender-Petersen: Den russiske litteraturs historie I—III, Copenhagen 1952 and Anthology of Old Russian Literature edited in collaboration with Stefan Congrat-Butler, New York 1954.The Struggle for the Russian market.Artur Attman: Den ryska marknaden i 1500-talets baltiska politik 1558-1595 Lund 1944.

Potassium ion and Na+ influx and efflux rates into and from excised barley roots are compared with the maximum capacity of accumulation. Potassium ion and Na+ influx and efflux involve a cation exchange that is independent of simultaneous exchange of the accompanying anion. These exchange fluxes depend on the concentration and cation composition of the solutions from which they originate. Selective differences between K+ and Na+ fluxes are sufficient to account for a cationic distribution within the roots that differs markedly from that of the external solution and that persists for extended time periods. The accumulation maximum is a cation exchange equilibrium with the cation influx and efflux rates approaching equality. The equilibrium level is independent of the individual cation fluxes and the external solution concentration. It is a finite quantity which appears to be determined by the internal anion concentration including accumulated as well as endogenous anions.

THE dependence of triplet state lifetimes on solvent viscosity noted in the first studies of triplet states in solution1is due, in part, to quenching by trace impurities not yet identified2,3. Hoffman and Porter3showed that, in certain molecules containing heavy atom substituents, the radiationless transition probability is increased to the point where it predominates over these trivial quenching processes and they conclude that, under these conditions, the measured lifetime corresponds to a true unimolecular radiationless conversion to the ground-state.

THE presence of NH radicals in the coma of comets has been generally attributed to photodissociation of ammonia. However, vacuum ultra-violet photolysis1(1236 Å) of ammonia results in emission at 3240 Å: while the cometary emission at 3360 Å corresponds to: The energy-level diagram for NH showing the position of the states and the transitions under discussion is shown in Fig. 1. In the vacuum ultra-violet flash photolysis of ammonia2,3, the NH absorption band at 3360 Å (AΠ3← X3Σ−) was observed.