220 EXPERIMENT STATION RECORD, 



bistories, uses, culture, diseases, etc. Appendixes are given which include the 

 scientific names, English and French common names, synonyms, etc. 



Contributions on plant breeding (Beitr. Pflanzetizucht, No. 4 (1914), PP- 

 VIII +162, figs. 24). — This report, issued by the Society for the Advancement 

 of Plant Breeding in Germany, gives an account of the fourth meeting at Bonn, 

 June 1-3, 1913, with the addresses delivered on the subjects listed below, and 

 discussions by numerous members: New Aims in Plant Breeding, by T. Remy; 

 The Production of Species Through Crossing and the Cause of Variability, by 

 J. P. Lotsy ; Modifications of Grape Stoclis Through Breeding, by Dern ; Sexual 

 Propagation in Plants and its Significance in Heredity, by M. Ivoernicke; Ten 

 Years of Practical Plant Breeding in Baltersbach (Winter Wheat, Maize, Peas, 

 etc.), by Pflug; Plant Breeding as a Developmental Factor in Colonial Agricul- 

 ture, by T. Roemer; The Problems and Practices in the Production of Tobacco 

 Seed, by H. Lange; Application of Results of Recent Investigations to Plant 

 Breeding in Agricultural Practice, by Dix ; and Beet Raising for Feeding Pur- 

 poses, by Tritschler. 



Hereditary variations in. chlorophyll content of cereals, H. Nilsson-Ehle 

 (Ztschr. Induktivc Abstani. v. Vcrerhungslehre, 9 (1913), No. 4, pp. 289-300, pi. 

 1). — Selective breeding experiments with several domestic cereals exhibiting 

 occasionally plants lacking chlorophyll or having other colors are said to have 

 led to the general conclusion that such variations in chloi-ophyll content are 

 recessive in relation to the normal or green color. It is pointed out that this 

 finding agrees with that of Emerson (E. S. R., 28, p. 231) for maize. 



Tobacco investigations, W. A. Setchell (California Sta. Rpt. 1914, PP- 

 152-156). — An outline is given of investigations in tobacco breeding which are 

 carried on under the author's direction. 



These different investigations include attempts to analyze the various factors 

 entering into the general inheritance, particularly to that of the flower, the 

 behavior of sterile and partially sterile hybrids, the fixation of hybrids, experi- 

 ments with the common peasant tobacco of Europe and the behavior of hybrids 

 between the difi'erent varieties, hj'brids between certain species of tobacco grow- 

 ing wild in California or cultivated by the Indians of that region, and observa- 

 tion of the parents of the various hybrids, together with a general study of 

 species of Nicotiana for future experimentation. 



Variation in bacteria, E. O. Jordan (Ahs. in Science, n. ser., 40 (1914), 

 No. 1039, p. 776). — The author has attempted to distinguish in specific cases 

 between true mutations and the more or less permanent adaptive modifications 

 in bacteria that are due to environmental conditions, and to determine the 

 relative value of each in the formation of so-called bacterial species and va- 

 rieties. The effect of the acclimatization upon bacteria is considered as part 

 of the problem. 



The flower pigments of Antirrhinum majus. — III, The red and magenta 

 pigments, Muriel Wheldale and H. L. Bassett (Blochem. Jour., S (1914), 

 No. 2, pp. 204-208). — In continuation of work noted on page 202. the authors 

 state that there are only two kinds of anlhocyanin in Antirrhinum, red and ma- 

 genta. Admixture with ivory pigment (apigenin) leaves these colors unaffected, 

 but admixture with yellow pigment (luteolin) gives two other colors, bronze and 

 crimson, respectively. Both red and magenta anthocyanin occur in varying 

 amounts, giving rise to tinged, pale, and deep varieties, and both contain more 

 oxygen than do the flavones, the percentage in the magenta being the higher. 

 It is thought that if anthocyanins are derived from flavones the process is in 

 part one of oxidation, as the anthocyanin molecules are thought to be larger than 

 is the flavone molecule. If a flavone constitutes the chromogen, condensation 



