44 GENETICS [Bot. Absts., Vol. V, 



pie is a "disproportionate modifier" of vermilion, i.e., it modifies vermilion (sex-linked) 

 more than it does normal eye color. — One series of multiple (quintuple) allelomorphs is de- 

 scribed; vestigial, strap, antlered, nick, all affecting wings. — The method of construction of 

 map of second chromosome is described in detail. The "second chromosome" was originally 

 defined arbitrarily as "that chromosome which carries the gene for black and such other genes 

 as may be found to be linked to black." Loci lying on the same side of black as does curved 

 were considered "to the right" or in plus direction from black; those on the opposite side "to 

 the left" or in minus direction. First distance mapped, black-purple, based on 4S.931 flies, 

 is 6.2 units (6.2 per cent crossing over), a distance small enough to exclude double crossing 

 over. Other loci located by combining data from different crosses, corrected, where neces- 

 sary, for double crossing-over, and weighted according to numbers and probable accuracy. 

 Thus vestigial was located 18.5 units to right of black, curved 27.0. These four loci form cen- 

 tral framework of chromosome. Dachs was next located at —17.5 (with reference to black) 

 streak at —31.1, star at —46.5. Most important locus at right end is speck, at +58.6 from 

 black. All other loci are located with reference to one or more of the foregoing. As star is 

 of known loci, farthest to left, it is taken as zero point, and other loci renumbered accordingly. 

 Present map of second chromosome, made in this way, with location of all genes treated, is 

 given in text; also constructional map, showing method of construction. — Working map, 

 subject to continuous changes, shows also value of each mutant. Value depends on constancy 

 of character, separability from normal, viability, fertility, accuracy of mapping, and location 

 at convenient distance from other important loci. — C. R. Plunkett. 



337. Burt, B. C, and N. Haider. Cawnpore-American cotton: An account of experi- 

 ments in its improvement by pure-line selection and of field trials, 1913-1917. Agric. Res. Inst. 

 Pusa Bull. 88. 32 p., 10 pi., 1 fig. 1919. 



338. Carle E. Selection pedigree appliquee a la variete local de riz Phung-tien. [Pedi- 

 gree selection applied to the local rice variety known as Phung-tien.] Bull. Agric. Inst. Sci. 

 Saigon 2 : 26-32. 1920. 



339. Cohen-Stuart, C. P. Erfelijkheidsleer in dienst der bestrijding van dierlijke 

 vijanden. [Genetics and the production of animal foods.] Te3 r smannia 1918: 37-48. 191S. 



340. Coppola, Alfredo. L'acrocefalosindattilia. Contributo alio studio delle disendo- 

 crinie congenite. [Acrocephalosyndactylism. A contribution to the study of congenital dis- 

 endocriny.] Revista di Patol. Nerv. e. Ment. 24: 283-339. 19 fig. Dec. 1919. 



341. Correns, C. Fortsetzung der Versuche zur experimentellen Verschiebung des Ge- 

 schlechtsverhaltnisses. [Continuation of the attempt to experimentally shift the sex ratio.] 

 Sitzungsber. Preuss. Akad. Wiss. Berlin 1918: 1175-1200. 3 fig. 1918. 



342. Crozier, W. J. Sex-correlated coloration in Chiton tuberculatus. Amer. Nat. 54: 

 84-S8. Jan. -Feb. , 1920. — Foot, ctenidia and other soft parts of male are pale buff color. Cor- 

 responding parts in female are salmon-pink to orange-red, depending principally on state of 

 maturity of ovary. Pigment belongs to carotin-like "lipochromes." Evidence shows that 

 color difference cannot possibly help in sex recognition and must therefore be looked upon 

 as a "metabolic accident." — H. L. Ibsen. 



343. Dahlgren, K. V. Ossian. Heterostylie innerhalb der Gattung Plumbago. [On the 

 occurrence of heterostyly in the genus Plumbago.] Svensk Bot. Tidskr. 12: 362-372. 8 fig. 

 1918. — Plumbago capaiisis Thunb., P. rosea L. and P. europaea L. are heterostylous plants. 

 The anthers in long-styled flowers are not placed so deeply in the tube as the stigma in brevi- 

 stylous ones. Stigmas of the two types are very different both in size and form. The differ- 

 ence between the pollens of the two sorts of plants is however relatively slight. Among forty 

 investigated herbarium specimens of Plumbago europaea 18 were short-styled and 22 long- 

 styled, which indicates that the two types may exist in about equal numbers. Heterostyly 

 seems to exist also in the genera Ceratostigma and Vogelia. — K. V. Ossian Dahlgren. 



