No. 1, July, 1920] PHY8IOLOG1 233 



1547. STONE, A. L. Testing of newly harvested field seed is difficult problem. 

 World 5 10 :37. 1919. -See Bot. Abets. 4, Entry L29. 



L648. SuMNBB, P. B. Adaptation and the problem of organic purposeful^ II. An 



Nat. 53:338 369. 1919. — See Bot. Absta. 3, Entrie 2202, 251f 



L549. Waldeon, Ralph AUGUSTUS. The peanut Arachis hypogaea; Its history, histology, 

 physiology, and utility. Contrib. Bot. Lab. Univ. Pennsylvania 4: 301-338 PI 

 See Bot. Absts. 1, Entry 139. 



1550. Watbeman, W. G. Development of root systems under dune conditions. 

 . 68:22 53. 17 fig. L919. 



L551. WOLF, Chableb G. L. Contributions to the biochemistry of pathogenic anaerobes. 

 VII. The biochemistry of Bacillus proteus. Jour. Path, and Bact. 22: 289-307. 1919. -Ba 

 proteua grown under various media (.peptone, glucose peptone, milk, cooked meat, sterile 

 urine) does not exhibit the qualities of a putrefactive organism. Compared with B. poro- 



<l< nea and B. histolyticv* its proteolytic activities are not grout. As a gas former, its actioi 

 moderate. The volatile acid production is small. The two Btrains of the organism studied 

 :it tacked lactose. The presence of an active urease capable of transforming 45 per cent of the 

 total nitrogen of urine into ammonia was demonstrated. No indol was found under the most 

 favorable conditions for its development. — W. W. Bonus. 



GROWTH, DEVELOPMENT, AND REPRODUCTION 



1552. Chandler, W. H. Pruning — its effect on production. Trans. Indiana Hortic. 

 Soc. 1918: 137-145. 156-161. 1919.— See Bot. Absts. 4, Entry 90S. 



1553. Crocker, William. Conditions affecting flower development. [Rev. of: (1) 

 Klebs, George. Ueber die Blutenbilduug von Sempervivum. Festschrift zum Ernst Stahl. 

 P. 1S8-151. Jena, 1918. (2) Fischer, H. Zur Frage der Kohlensaure-Ernahrung der Pflan- 

 zen. Gartenflora 65:232-237. 1916. (3) Kraus, E. J., and H. R. Kraybill. Vegetation 

 and reproduction with special reference to the tomato. Oregon Agric. Exp. St a. Bull. 149. 

 90 p. 1918.1 Bot. Gaz. 67: 445-446. May, 1919. — "These papers have thrown much light on 

 some of the nutrient factors modifying-vegetation and reproduction in plants. The contri- 

 bution of Kraus and Kraybill apparently puts into the hands of producers one of the impor- 

 tant means of controlling fruitfulness. Fischer's less extensive and one-sided attack caused 

 him to miss the fact that a very high C/N not only reduces vegetative growth but diminishes 

 reproduction." [See Bot. Absts. 1, Entry 1402; 2, Entry 601.]—//. C. Cowles. 



1554. Crocker, William. Wound callus and bacterial tumor. [Rev. of: Magnus, 

 Werner. Wund-Callus and Bakterien-Tumore. Ber. Deutsch. Bot. Ges. 36: 20-29. 1918 

 (See Bot. Absts. 2, Entry 610).] Bot, Gaz. 67: 516-517. 1919. 



1555. Ensign, M. R. Venation and senescence of polembryonic citrus plants. Amer. 

 Jour. Bot. 6:311-329. 6 fig. 1919. — It is known that in polyembryonic seeds of Citrus one 

 of the embryos is gametic and the others apogamous. Hence a study of the comparative 

 size of vein-islets in the leaves of a pair of seedlings produced from a single seed may afford 

 evidence of the dependence of rejuvenescence on sexual reproduction. Germination tests 

 show that 43 per cent of the seeds of Citrus grandin produce more than one hypocotyl. The 

 size of the vein-islet is constant for all parts of a given leaf; it increases slightly as the leaf 

 matures; in mature leaves it is the same in healthy and chlorotic plants, and in large and small 

 leaves; finally, it is identical in the mature leaves of two seedlings produced from a polyem- 

 bryonic seed. The nucleo-cytoplasmic ratio, which has been thought to be a criterion of cell- 

 age, is essentially the same in the root meristems of gametic and apogamous plants. Differ- 

 ences in vigor in members of a pair of seedlings are due to differences in cotyledon-size rather 



