No. 1, August, 1920 GENETICS rjl 



holm, 1920. — Mentions reasons for and importance of establishing a race-biological institute. 

 Parliament is asked to demand a special proposal for the organization of such an institute. — 

 K. V. Ossian Daldgrcn. 



440. Piltz, J. Uber homologe Hereditat bei Zwangsvorstellungen. [On homologous he- 

 redity in hallucination.] Zeitschr. ges. Neur. u. Psych. 43. 1918. 



441. Plunkett, C. R. Genetics and evolution in Leptinotarsa. Amer. Nat. 53:561-566. 

 Nov.-Dec, 1919. — Tower's work is almost entirely in agreement with the modern Mendelian 

 theory of heredity. Where there is apparent disagreement, critical evidence is lacking 

 because of Tower's failure to subject the individuals he worked with to a rigorous genetic 

 analysis. — Alexander Weinstein. 



442. RagioniIsri, Attilio. Un bel problema per i biologi: Sulla comparsa dell' odore nei 

 fiore delle "roselline di Firenze" (Ranunculus asiaticus var.). [A good problem for biologists: 

 On the appearance of odor in the flowers of the "Florentine roselline" (Ranunculus asiaticus).] 

 Bull. R. Soc. Toscana Orticult. 44: 87-94. 1919.— See Bot. Absts. 4, Entry 1832. 



443. Rasmuson, Hans. Genetische Untersuchungen in der Gattung Godetia. [Geneti- 

 cal investigation within the genus Godetia.] Ber. Deutsch. Bot. Ges. 37: 399-403. 1919 — 

 A very condensed preliminary note about author's experiments with Godetia Whitneyi and G. 

 amoena. Branching habit, leaf-characters, color, size, form and doubleness of the flowers, 

 are analyzed. — K. V. Ossian Dahlgren. 



444. Raum, J. Ein weiterer Versuch iiber die Vererbung die Samenfarbe bei Rotklee. 

 [A further study on the inheritance of seed color in red clover.] Zeitschr. Pflanzenziicht. 7: 

 148-155. Dec, 1919. 



445. Rebel, H. Ein neuer Tagfalterhybrid. [A new butterfly hybrid.] Verhandl. K. u. 

 K. Zool. Bot. Ges. Wien 68: 273-276. 1918. 



446. Richet, C., and H. Cardot. Mutations brusques dans la formation d'une nouvelle 

 race microbienne. [Sudden mutations in the formation of a new race of microbes.] Compt. 

 Rend. Acad. Sci. Paris 168: 657-663. 1919. 



447. Roberts, Herbert F. A practical method for demonstrating the error of mean 

 square. School Sci. Math. 19: 677-692. Nov., 1919.— This paper treats of the mean, the 

 standard deviation and coefficient of variation with especial reference to practical methods 

 of illustrating the error of the mean square to students of little training in mathematics. — 

 John W. Gowen. 



448. Roemer, Th. tiber Lupinenziichtung. [On Lupine breeding.] Deutsch. Landw. 

 Presse 1919: 174-175. 1919.— See Bot. Absts. 5, Entry 299. 



449. Rother, W. Phyllokakteen Kreuzungen. [Phyllocactus crosses.] Monatsschr. 

 Kakteenkunde 29: 32-33. 1919.— Reciprocal crosses of P. Wrayi and P. Vogclii are described 

 and differentiated. — A. S. Hitchcock. 



450. RrjzicKA, Vladislav. Restitution und Vererbung. Experimenteller, kritischer 

 und synthetischer Beitrag zur Frage des Determinationsproblems. [Restitution and heredity. 

 Experimental critical and synthetic contribution to the problem of determination.] Julius 

 Springer: Berlin, 1920. 



451. St. John, Harold. Two color forms of Lobelia cardinalis L. Rhodora 21: 217-21S. 

 1919. — Describes variation in color of flowers of Lobelia cardinalis. A form with rose-colored 

 flowers, found in New Hampshire, is named/, rosea. One with white flowers was named alba 

 by A. Eaton in 1836.— T. D. A. Cockerell. 



