No. 1, August, 1921] GENETICS 43 



267. P^ZARD, Albert. Facteur modificateur de la croissance normale et la loi de com- 

 pensation. [The modifying factor of the law of normal increase and the law of compensation.] 

 Conipt. Rend. Acad. Sci. Paris 169: 997-1000. I919.-Pullets were found by IIou.s.s.\y and 

 the author to experience an interruption in growth some weeks prior to commencement of 

 laying, the growth curve dipping downward, but subsequently rising to same level as if no 

 such interruption liad occurred. Author found, in 3 individuals tested, that growth was 

 uninterrupted if ovariectomy was performed some time before the depression of the growth 

 curve would normally have occurred. — F. B. Sumner. 



2GS. Plate, L. [German rev. of: Adametz, L. Studien iiber die Mendelsche Verer- 

 bung der wichtigsten Rassenmerkmale der Karakulschafe bei Reinzucht und Kreuzung mit 

 Rambouillets. (Studies on the Mendelian characters of the Karakul sheep in pure breeding 

 and in crosses with Rambouillets.) 258 p., 16 pi. Borntraeger: Berlin, 1917.] Arch. Ilas- 

 sen- u. Gesellschaftsbiol. 13: 30C-309. 1921. 



269. Ragioxieri, A. Brassica crosses. Card. Chron. 68: CO. 1920. — Author describes 

 hybrids resulting from crosses between Chinese cabbage, Pe-tsai, and other Brassicas. The 

 work was done at Castello, Italy. It is pointed out that Pe-tsai has good qualities which the 

 plant breeder should not overlook. It grows rapidly, produces many tender leaves in large 

 firm heads, and is of good flavor. In a number of the crosses of this with other Brassicas, 

 no fertile seed resulted. Where good seeds were obtained, the Fi plants showed great vigor. 

 Fi plants from crosses with the white turnip {B. rapa) were vigorous and without sign of a 

 bulb. The tendencies to produce a bulb and an entire leaf were both recessive, and both 

 characters appeared in F2 in the Mendelian ratio. The bulbs in the 2nd generation showed 

 a great variety of shapes. It was demonstrated that there is a great sexual affinity between 

 B. rapa and B. chinensis var. Pe-tsai, and a very weak one between the latter and B. ole- 

 racea. — ^4. C. Eraser. 



270. Rasmuson, Hans. Die Hauptergebnisse von einigen genetischen Versuchen mit 

 verschiedenen Formen von Tropaeolum, Clarkia und Impatiens. [The chief results of some 

 genetical studies with different forms of Tropaeolum, Clarkia, and Impatiens.] Hereditas 

 1: 270-276. 1920. — A preliminary paper without data. Dark green color of leaves in Tro- 

 paeolum majus is determined by 2 factors. If either is recessive, color is probably green. 

 Green color is dominant to yellow-green and both to variegated. Variegation in flowers is 

 dominant to self color and dark color to light. Investigations were made of the behavior 

 of purple, dark yellow, light yellow, and yellow variegated color in Tropaeolum; purple, 

 purplish-red, lachs-red, and white color in Clarkia elegans; purple, purplish-red, white, and 

 purple with white edge in Clarkia pidchella; blue, blue-red, red, pink, white, and white var- 

 iegated in Impatiens balsamina. In Tropaeolum sharp monohybrid segregation was found 

 between nana and normal types, but in Impatiens F2 generation shows intermediate forms. — 

 M. Demerec. 



271. Renner, O. [German rev. of : (1) Forsaith, C. C. Pollen sterility in relation to the 

 geographical distribution of some Onagraceae. Bot. Gaz. 62:406-487. 1916; and (2) Cole, 

 R. D. Imperfection of pollen and mutability in the genus Rosa. Bot. Gaz. 63: 110-123. 1917.] 

 Zeitschr. Bot. 13:96-97. 1921. 



272. Strampelli, N. Genealogia del frumento Carlotta Strampelli. [Genealogy of the 

 grain Carlotta Strampelli.] Atti R. Accad. Lincei. Roma Rend. CI. Sci. Fis. Mat. e Nat. 27: 

 131-135. Fig. I-4. 1918. — "Carlotta Strampelli" wheat was originated by the author by 

 selection from the progeny of a hybrid made in 190^1 or 1905 between Rieti and Massy. The 

 work was done in connection with extensive experiments made to produce high-\-ielding vari- 

 eties adapted to climate and soil of central and northern Italy, resistant to rust, and with 

 tall straw yet not liable to lodge. This selection, fulfilling the requirements, was named in 

 1914 and exhibited in Rome. Grown 4 j-ears since then in various provinces of northern Italy 

 it averaged about 5.5 quintals per hectare (8j bushels per acre) more than other varieties. — 

 At least 100,000 hectares were sown in 1918. Further increase in acreage sown to the variety 

 is anticipated. — C. E. Leighty. 



