142 GENETICS [Bot. Absts. 



973. Anonymous. (J. F.) Variability in plants. Gard. Chron. 65: 285-2S6. June 7, 

 1919. — Occurrence of three cotyledons amongst dicotyledonous plants is quite frequent, espe- 

 cially in Fuchsia macrostemina where opposite leaves and three in a whorl may be found on 

 the same plant. Acer pseudoplatanus quite frequently produces two, three and four cotyl- 

 edons. Three cotyledons are followed by three leaves in a whorl. — Tuberous-rooted begonias 

 show important botanical disturbances. The ovary is normally inferior and seed vessel 

 closed, but double garden forms have been observed with ovary superior, valves of seed vessel 

 transformed into petals and bearing the ovules or unfertilized seeds on their upper surface. — 

 C. E. Myers. 



974. Anonymous. (J. F.) Variability in plants. Gard. Chron. 65: 321. June 28, 1919. 

 — Has observed tricotyledonous and polycotyledonous seedlings in several species of normally 

 dicotyledonous ornamentals. Holds that flower parts vary so widely in number that the 

 plan of using the least common multiple as a basis of classification is impractical. [See Bot. 

 Absts. 3, Entries 1022,1023.]— Jo hn Bushnell. 



975. Anonymous. (W. T.) Variability in plants. Gard. Chron. 65: 286. June 7, 1919. 

 — States that seedlings with three cotyledons and leaves in whorls of three are not uncommon 

 in Fuchsia; smaller branches of such plants may have leaves opposite. [See Bot. Absts. 3, 

 Entries 973,1021.]— John Bushnell. 



976. Arny, A. C, and H. K. Hayes. Experiments in field technique in plat tests. Jour. 

 Agric. Res. 15: 251-262. 1918. — This is a study of the border effect in experimental field plots 

 planted to various cereal crops, including wheat, oats, and barley, in 6-inch drill rows, with 

 alleys between plots. Yields are compared, removing one border row and two border rows. 

 — Border rows contribute a very marked increased yield per acre to the plots, the effect show- 

 ing in a margin of at least one foot wide. Different varieties appear to respond differently 

 to this border effect. The report is based upon the results of only a single season. — L. H . 

 Smith. 



977. Bartlett, J. Gardner. The increase, diffusion, and decline of the Mayflower and 

 other New England stock. Jour. Heredity 10: 141-142. Fig. 20. Mar., 1919.— An article 

 dealing statistically with the increase and diffusion of the Mayflower stock with reference to 

 an article by S. J. Holmes and C. M. Doud, Jour. Heredity, November, 1918 [See Bot. Absts. 

 2, Entry 414]. The author finds that the present conditions are not so desperate as pictured 

 by the authors of the previous article, since statistics are given to show that there is a gradual 

 increase in the Mayflower descendants. — M. J. Dorsey. 



978. Baur, Erwin. Ueber eine eigentumliche mit absoluter Koppelung zusammenhang- 

 ende Dominanzstorung. [On a peculiar disturbance in dominance associated with absolute 

 coupling.] Ber. Deutsch. Bot. Ges. 36: 107-111. 1918. — If a certain external character de- 

 pends upon two dominant factors, X and Y, the hybrid between the two races, of which the 

 one contains X and the other Y usually will show this character. The writer finds in crosses 

 with Antirrhinum, however, that, if the two factors in question show absolute coupling, the 

 hybrid does not show the character, but presents the character caused by X alone on one part 

 of the plant and that caused by Y alone in another part of the plant; thus a cross between 

 striped and purple, expected to yield a red-flowered Fi, gave striping on a purple ground. — 

 T. J. Stomps. 



979. Blakeslee, A. F. A unifoliolate mutation in the Adzuki bean. Jour. Heredity 10: 

 153-155. Fig. 2. April, 1919. — In a population of over 450,000 plants of Phaseolus angularis, 

 which is normally trifoliolate, a single unifoliolate plant appeared. It produced flower buds 

 abundantly, but no flowers developed, the buds dropping at a stage before the petals were 

 visible. The mutant was larger than others of its pedigree, was completely sterile, although 

 buds were formed, and because it did not produce fruit, its vegetative functions were not check- 

 ed and it held its leaves longer. Such a type has been observed once before in three individ- 

 uals of Phaseolus vulgaris. This undivided leaf type is interesting since the plants of this 

 genus so predominately bear compound leaves. — M. J. Dorsey. 



