June, 1920J GENETICS 321 



2149. Kannan, K. Kunhi. Mutation in Coccidae. Trans. Entomol. Sue. London 1918: 

 130-148. 4]>l- 1018. -Typical specimens of the scale insect, dorr us viridis, originally de- 

 scribed from Ceylon, appeared in Mysore in Southern India, in 1012. These had normal 

 seven-jointed antennae. All' specimens collected in later years were found bo have a reduced 

 number of joints, usually three. The author considers that a mutation had taken place. 

 The variations of Coccus nitidis in different parts of the world, and of an allied species, Pul- 

 vinaria psidii, are discussed. From a consideration of these variations, the author considers 

 it probable that C. viridis has arisen from P. psidii, directly or indirectly, by mutation. [See 

 Bot. Absts. 3, Entry 2130.]— Sewcdl Wright. 



2150. Karper, R. E., and A. B. Conner. Natural cross-pollination in milo. Jour. 

 Amer. Soc. Agron. 2: 257-250. 1010. — 41 heads of white milo [Sorghum] which had been me- 

 chanically introduced into a plat of yellow milo were selected and planted the following 

 year. Of 13,430 progeny, 788 were hybrid plants with yellow seed heads, 42 were hybrid 

 plants not classed as yellow, while the percentage of cross fertilization was 6.18. — F. M. 

 Schertz. 



2151. Karsten, G. [Rev. of: Ernst, A. Bastardierung als Ursache der Apogamie im 

 Pflanzenreich ; eine Hypothese zur experimentellen Vererbungs- und Abstammungslehre. 

 (Hybridization as the cause of apogamy in the plant kingdom; an hypothesis for experimental 

 evolution and genetics.) 8 vo., xv + 655 p., 2 pi., 172 fig. Gustav Fischer: Jena, 1018.] 

 Zeitschr. Bot. 11 : 53-61. 1010.— See also Bot. Absts. 3, Entry 2113. 



2152. Kempton, J. H. Inheritance of apotted aleurone color in hybrids of Chinese maize. 

 Genetics 4: 261-274. 3 Jig., 3 diagrams. May, 1010. — Spotted aleurone-color pattern is due 

 to factor S but observed only when female parent of cross is heterozygous for aleurone- 

 color factor R or is r r. Selfed ears of composition R r S s had 20.4 per cent of colored seeds 

 spotted. Observed percentage of spotting is assumed to be due to linkage of R and S with 

 12.5 per cent crossing-over. — R. A. Emerson. 



2153. Kempton, J. H. Inheritance of waxy endosperm in maize. U. S. Dept. Agric. 

 Bull. 754. 99 p., 14 fig. June 26, 1010.— Counts of 108 ears with over 100,000 seeds of crosses 

 of waxy with corneous endosperm showed a statistically significant deficiency of waxy 

 segregates from the expected 25 per cent. Reciprocal crosses of heterozygous plants with 

 homozygous waxy indicated, in some cases, a deficiency of effective male gametes bearing 

 waxy. Author suggests unequal segregation or differential vigor or death rate. With re- 

 spect to aleurone color, author reports a slight but statistically significant excess of white 

 seeds over expected 25 per cent from selfed ears and a similar deficiency of white from ears 

 back-crossed to recessive. Waxy endosperm was found not linked with aleurone-color 

 factor R but linked with C, the percentage of crossing-over usually approximating 25 but in 

 some cases approaching 20. — R. A. Emerson. 



2154. Kihara, Hitoshi. Ueber cytologische Studien bei Getreidearten. Mitteilung II. 

 Chromosomenzahlen und Verwandtschaftverhaltnisse unter Avena-arten. [Cytological studies 

 in the cereals. II. Chromosome counts in reference to the relationship of oat species.] Bot. 

 Mag. Tokyo 33: 04-07. 2. fig. 1010— See Bot. Absts. 3, Entry 1039. 



2155. Klebahn [H.] [Rev. of: Bartlett, Harley Harris. Mass mutation in Oeno- 

 thera pratincola. Bot. Gaz. 60: 425-456. 1015.] Zeitschr. indukt. Abstamm. Vererb. 21: 

 134-136. July, 1010. 



2156. Kottur, G. L. Note on protecting the cotton flowers from natural crossing. Poona 

 Agric. Coll. Mag. 9: 131-132. 3 fig. 1018. — Points out necessity of preventing natural cross- 

 pollination of cotton flowers from which pure seed is desired and describes method of wiring 

 fully developed but closed flower bud so as to prevent opening of corolla. [Similar method 

 described by Rowland M. Meade in U. S. Dept. Agric. Bur. Plant Ind. Circ. 121:20-30. 

 1913.]— T. H. Kearney. 



