No. 2, September, 1920] PHYSIOLOCIV 28'.) 



2212. Nicolas, G. Contribution a l'etude des relations qui existent dans les feuilles, 

 entre la respiration et la presence de l'anthocyane. [Relations which exist in the leaves between 

 respiration and the presence of anthocyanin.] Rev. G6n. Bot. 31: 161-178. 1919. — Compara- 

 tive studies of the respiration of red and green leaves of the same species were made. It was 

 found that leaves which become red as a result of some external influence (for example, light 

 intensity, low temperature, or attacks of parasites) and those leaves which are red when 

 young, becoming green later in their development, show an intensity of respiration greater 

 than the green leaves of the same species. This is especially true with regard to the amount 

 of oxygen absorbed. The leaves which are normally red, that is, turn red in old age, have a 

 much lower respiratory intensity than the green leaves of the same species. The influence 

 of old age furnishes sufficient explanation for this lower value. The respiratory quotient 

 (CO2/O2) is, with one exception, always lower in the cases of the red leaves. These results 

 indicate a greater fixation of oxygen in the red leaves than in the green leaves. Analyses 

 for acidity showed in every case a greater acidity in the red leaves. The author states that 

 in the leaves accidentally reddened there is a greater accumulation of soluble carbohydrates. 

 He thinks that the greater acidity of the red leaves is due to the presence of these compounds, 

 resulting in a greater fixation of oxygen and a consequent lowering of the respiratory quotient. 

 —R. S. Nanz. 



2213. Peirce, G. J. Testing seeds with a thermometer. Sci. Amer. Monthly 1 : 259. 

 1920. — The vitality, germinating and growing power, cleanness and soundness of seeds can be 

 determined, according to the kind of seed, by their temperature behavior when placed in ster- 

 ile water in Dewar flasks or thermos bottles for 2 days. — Chas. H. Otis. 



ORGANISM AS A WHOLE 



2214. Boyer, G. Etudes sur la biologie et la culture des champignons superieurs. [Biol- 

 ogy and culture of higher fungi.] Mem. Soc. Sci. Phys. Nat. Bordeau xVII. 2 : 233-344. IV pi. , 

 SO fig. 1918.— See Bot. Absts. 5, Entry 1931. 



2215. Brenchly, Winifred E. Some factors in plant competition. Ann. Appl. Biol. 6: 

 142-170. PI. 5, 10 fig. 1919. 



2216. C. A. H. [Rev. of: Lumiere, Anguste. Le mythe des symbiotes. (The myth of 

 symbiosis.) xi+205 p. 8°. Masson: Paris, 1919.] Jour. Botany 58: 26. 1920. 



2217. Jivanna Rao, P. S. The formation of leaf-bladders in Eichornia speciosa, Kunth 

 (Water hyacinth). Jour. Indian Bot, 1:219-225. 5 fig. 1920.— See Bot, Absts. 5, Entry 1893. 



2218. M anaresi, A. Sulla biologia fiorale del pesco. 2 nota. [Floral biology of the peach. 

 2nd note.] Staz. Sperim. Agrarie Italiane 52: 42-67. 1919. — See Bot, Absts. 5, Entry 1757. 



2219. Shreve, Forrest. Physiology of the mangrove. [Rev. of: Bowman, H. H. M. 

 Ecology and physiology of the red mangrove. Proc. Amer. Phil. Soc. 56: 589-672. PI. $-9. 

 1917.] Plant World 22 : 146-147. 1919. 



GROWTH, DEVELOPMENT, REPRODUCTION 



2220. Calkins, Gary N. The effect of conjugation. Proc. Soc. Exp. Biol, and Med. 16: 

 57-60. 1919. — From a study of Uroleptus mobilis, the writer presents data showing that the 

 absence of conjugation promotes a noticeable physiological weakness ultimately ending in 

 natural death, while the presence of conjugation promotes a rejuvenescence of the protoplasm. 

 — R. W. Webb. 



2221. Chambers, Mary H. The effect of some food hormones and glandular products on 

 the rate of growth of Paramecium caudatum. Biol. Bull. [Woods Hole] 36: S2-91. 1919. — 

 As a food hormone potato extract has little effect on the division rate. The influence of yeast 



