260 " GENETICS [BoT. Absts., Vol. VII, 



1795. Leake, H. Martin, and B. Ram Pershad. A preliminary note on the flower colour 

 and associated characters of the opium poppy. Jour. Genetics 10: 1-20. 1 pi. July, 1920. — 

 On basis of color and its distribution authors arrange Indian poppies in five groups: (1) 

 White-eyed group, due to two factors P and R. P alone determines pink margin to petal and 

 lacks dominance, giving light pink heterozygotes. R is intensifier of P and in absence 

 of latter gives no visible results. Factor R possesses dominance but its results are deep or 

 light depending on duplex or simplex condition of P. (2) Purple group, dependent on pres- 

 ence of genes M and L and absence of P. AI shows complete dominance and develops mauve 

 purple in margin with a deeper eye. L intensifies results of M giving magentas. (3) Dilute 

 color group, v/here P and M are present and L absent. R is inhibited in presence of M. 

 Marginal color is dilute and eye colored. (4) Full color group, factorially like last but with 

 L in addition. Two of subsidiary variations within this group dependent on homo- or hetero- 

 zygosity of P as was true also of third group. (5) While-fioxoered group, whose genetic diver- 

 sity is mentioned. The securing of extracted whites from two pure [homozygous] colored 

 plants points to two independent anthocyan bases. — Factor P is correlated with short vege- 

 tative period. Groups 1 and 5 are white-seeded, while 2, 3, and 4 have colored seeds. La- 

 ciniated petal is simple dominant to entire petal. Small, more or less sepaloid petals seemed 

 a simple recessive. — James P. Kelly. 



1796. Lehmann, Ernst. Variabilitat und Bliitenmorphologie. [Variability and floral mor- 

 phology.] Biol. Zentralbl. 38: 1-38. Jan., 1918. — 'Author reviews literature (120 titles in list) 

 relating to morphology and variability of flower beginning with Linnaeus who emphasized 

 the typical, outlawed large variations, labelling them as monstrous or teratological, and 

 ignored small variations. Goethe's plea that normal and abnormal be treated together is 

 given prominence. De Candolle and von Mohl are cited as agreeing with Goethe. 

 Author points out looseness of usage of terms monstrosity and deformity and approves Sten- 

 zel's substitution of deviation, abnormality, and anomaly. In case of last two terms further 

 analysis was made possible especially by Vochting who introduced a statistical treatment. 

 Now a relatively infrequent case that fits into a Gaussian distribution is named, following 

 Klebs, simply a variation just as are narrower and commoner deviations. Author surveys 

 applications that have been made of statistical methods to flowers. Originally numerical 

 evaluation limited to type [mode]. Cockerell, Burkill, and Ludwig were among first to 

 use mean. De Vries did pioneer work on character of curves of distribution. Verschaf- 

 felt first directed attention to degree of variability in floral cycles using the quartile, but 

 later many authors used a-. Much has been done on causes of floral variation : soil conditions, 

 light, temperature, heredity, age of plant. Lastly, correlation is treated, especially work on 

 Crassulaceae by Klebs, on Ficaria, Paris, and Parnassia. — James P. Kelly. 



1797. Leighty, Clyde E. Natural wheat-rye hybrids of 1918. Jour. Heredity 11: 129- 

 186. Fig. 19-22. Mar., 1920. — Hybrids between wheat and rye are rare but in 1918 nineteen 

 instances were found at Arlington Farm and three at the Virginia Agricultural Experiment 

 Station. It is evident from a comparative analysis of the plants that they are hybrids of 

 wheat as the female parent and rye. The hybrids are one to five per cent fertile and some 

 Fj generation plants are being grown. [See also Bot. Absts. 7, Entry 1703.] — ■/. H. Beaumont. 



1798. VAN DER Lek. [Dutch rev. of: Fischer, Ed. Der Speziesbegriff und die Frage 

 der Spezies-Entstehung bei den parasitischen Pilzen. (The species concept and the question 

 of the origin of species in the parasitic fungi.) Verhandl. Schweiz. Naturf. Ges. 98 Jahresver- 

 sammlung.] Genetica 2 : 459-462. Sept., 1920. 



1799. VAN DER Lek. [Dutch rev. of : France, R. H. Der Parasitismus als schopferisches 

 Prinzip. (Parasitism as a creative principle.) Centralbl. Bakt. 59:54-64. 6 fig. 1920.] 

 Genetica 2 : 462-464. Sept., 1920. 



1800. VAN der Lek. [Dutch rev. of: Klebahn, H. Impfversuche mit Pfropfbastarden. 

 (Infection experiments with graft hybrids.) Flora 11 /12: 418-430. 1918. (See Bot. Absts. 3, 

 Entry 2124; 4, Entry 3512.)] Genetica 2: 468-471. Sept., 1920. 



