No. 1, July, 19201 PHYSIOLOGY 239 



1588. Jones, L. R., and II. II. McKlNNEY. The influence of soil temperature on potato 

 scab. Phytopath. 9:301 302. 1019.— Sec Bot. Abate, I, Entry i:«)s. 



1589. LIVINGSTON, B. E. Frost injury. [Rev. of: BARVET, R. B. Hardening process in 

 plants and development from frost injury. Jour. Agric lies. 15:83-111. PI. 7-11, and L, 



8 fig. 1918.1 Plant World 21:299 :5(M). I91S. 



1590. Pammbl, L. II. Effect of winter on shrubs at Ames, Iowa. lt«-pt. [owa Si 



llortic. Soc. 53: 159 -11. IMS.— Sco Hot. Absts. 1, Entry 868. 



1591. STEVENS, Neil E., and C. IT. HiaoiNS. Temperature in relation to quality of sweet 

 corn. Jour. Agric. Res. 17:275-284. I fi<J. 1919. — The conclusions of Applemao and Arthur 

 (Jour. Agric. Res. 17: 137-152. 1919) that the rut c of lo.s.s of sugar in picked sweet-corn in- 

 creases with a rise in temperature :irc confirmed. A different variety, Early Bantam, 

 used. — The rate of respiration of picked corn also varies with temperature, being gri 

 higher temperatures, at least up to 30°. — The temperature of green corn on the stalk is near 

 that of the air, if shaded, and higher if in the sun. — The average temperature of the corn 

 picking season in Maryland (August) is much higher than the corresponding season in Maine 

 (September) and this difference is sufficient to allow considerably greater deterioration in picked 

 corn in Maryland during a given period. Under identical conditions of practice corn preserved 

 in Maine (north) would be superior (sweeter) to that canned in Maryland (south). — 1>. 

 Rcddick. 



1592. Vass, A. F. The influence of low temperature on soil bacteria. Cornell Univ. 

 Agric. Exp. Sta. Mem. 27: 1039-1074. 1919.— Using field soils, a study is made of the effect 

 of the rate of thawing, alternate freezing and thawing, and the length of time frozen on the 

 number of soil bacteria as shown by the agar plate. The increased count in frozen soil 

 attributed to a breaking up of the clumps of bacteria. Bacillus radicicola in soil culture does 

 not seem to be affected by freezing. In nutrient solutions concentrations of dextrose and 

 glycerin of one per cent and above exert a protective influence against low temperature. 

 [See Bot. Absts. 4, Entry 1648.]— IF. H. Chambers. 



1593. Waldron, C. B. Factors in hardiness. Rept. Iowa State Hortic. Soc. S3: 115- 

 119. 1918. — Summarizing his discussion the author says: "Hardiness then, as we use the term, 

 is a quality so fundamentally inherent in plants as to be modified little or not at all by selec- 

 tion over reasonable periods of time." Early maturity is another factor. Winter killing is 

 frequently caused by sudden freezing of roots not fully matured. More attention should be 

 given to the origin of plants. In breeding, one of the plants should be of known hardiness. — 

 L. H. Pammel. 



RADIANT ENERGY RELATIONS 



1594. Anonymous. How plants and animals utilize color. Pigments that protect living 

 matter against radiation. Sci. Amer. Supplem. 87: 102. 1919.— A review of the more recent 

 literature, with bibliography. — Chas. H. Otis. 



1595. Coulter, J. M. The luminous moss. [Rev. of : Yasumochi, Toda. Physiological 

 studies on Schistostega osmundacea (Dicks) Mohr. Jour. Coll. Sci. Tokyo 40: No. 5. SO p. 

 2 pi. 1918.] Bot. Gaz. 67:278-279. 1919— See Bot. Absts. 1, Entry 739. 



1596. de Besterio, Dolores C, and Michel-Duraxd. Influence de la lumiere sur 

 l'absorption des matieres organiques du sol par les plantes. [Influence of light on absorption of 

 organic compounds.] Compt. Rend. Acad. Sci. Paris 168:467—170. 1919. — Plants of Pisum 

 sativum were grown in cultures on Knop's solution, to which 4 parts glucose per 1000 were 

 added, the roots developed under aseptic conditions, the tops being free in the air. Cultures 

 were exposed to light intensities corresponding to J, J, } and complete sunlight. The dry 

 weights of the entire plants, as well as the roots, increased with the light intensity. The 



