No. 2, March, 1921] PHYSIOLOGY 201 



METABOLISM (RESPIRATION) 



1352. Bailey, C. H., and A. M. Gurjar. Respiration of cereal plants and grains. II. 

 Respiration of sprouted wheat. Jour. Biol. Chem. 44: &-7. 1 fig. 1920. — Respiration proceeds 

 at a higher rate in the sprouted wheat than in normal wheat. At 12.5 to 14 per cent water 

 content the ratios of the respiratory rate in (1) normal wheat, (2) wheat germinated 24 

 hours, (3) wheat germinated 48 hours was not far from the ratios of their reducing sugar 

 content. — G. B. Rigg. 



1353. Bailey, C. H., and A. M. Gurjar. Respiration of cereal plants and grains. III. 

 Respiration of rice paddy and milled rice. Jour. Biol. Chem. 44: 9-12. Fig. 1. 1920.— The 

 germ, or the embryo, is the seat of the most active respiration in a typical grain. — G. B. Rigg. 



1354. Bailey, C. H., and A. M. Gurjar. Respiration of cereal plants and grains. IV. 

 The respiration of frosted wheat plants. Jour. Biol. Chem. 44: 13-15. 1920. — Frozen plants 

 respired more vigorously during the first 24 hours after thawing than did plants that had not 

 been frozen. — G. B. Rigg. 



ORGANISM AS A WHOLE 



1355. BuDER, Johannes. Aus der Biologie der Purpurbakterien. [The biology of the 

 purple bacteria.] NaturAvissenschaften 8: 261-268. 2 fig. 1920.— This paper brings together 

 some of the latest results which contribute to the biology of this unique group. It discusses, 

 first, the different members of the group and their classification according to their sulphur 

 content and pigmentation. Absorption curves of bacteriopurpurin as well as one of the 

 living bacteria themselves are reproduced, together with a figure showing the characteristic 

 gathering of the bacteria in different regions of the spectrum. This last shows an unusual 

 response of the bacteria to ultra red rays, the physiological and ecological significance of 

 which is discussed. The phototactic movements of the purple bacteria are also considered. — 

 Orton L. Clark. 



1356. Galippe, V. Des micro-organismes vivant dans le papier; leur resistance ^ Taction 

 de la chaleur et k celle du temps. [The micro-organisms of paper; their resistance to the action 

 of heat and weather.] Compt. Rend. Acad. Sci. Paris 169: 814-817. 1919.— Examination of 

 ancient papers and papyrus demonstrated the presence of large numbers of micro-organisms 

 which were secured in pure cultures. The author concludes from his studies that many 

 bacteria are extremely resistant to the action of various unfavorable factors of their environ- 

 ment and are capable of existing for long periods of time. — V. H. Young. 



1357. JoFFE, Jacob S. The influence of soil reaction on the growth of alfalfa. Soil Sci. 

 10:301-307. 1 fig. 1920.— See Bot. Absts. 7, Entry 1398. 



1358. Whiting, A. L., and Roy Hansen. Cross-inoculation studies with the nodule bac- 

 teria of lima beans, navy beans, cowpeas, and others of the cowpea group. Soil Sci. 10: 291- 

 300. 1920.— See Bot. Absts. 7, Entry 1406. 



GROWTH, DEVELOPMENT, REPRODUCTION 



1359. Blackman, V. H. The significance of the efficiency index of plant growth. New 

 Phytol. 19:97-100. 1920.— This is an answer to the paper by Kidd, West, and Briggs. 

 It is pointed out that "the efficiency index does nevertheless give a measure of the plant's 

 average efficiency during any particular period." — I. F. Lewis. 



1360. BosE, J. C. Researches on growth of plants. Nature lOS: 615-617. 3 fig. 1920. 

 — Brief descriptions of methods, figures of the high magnification crescograph and of some 

 records. — 0. A. Stevens. 



