No. 1, August, 1920] GENETICS 35 



250. Welo, L. A. Emergency seasoning of Sitka spruce. Sci. Amor. Supplem. 87: -10 1- 

 405. 2 fig. 1919. 



251. Wood, B. R. Note on proposed system for regeneration of sal forests. Indian For- 

 ester 45: 403-413. 1919. — Changes in the management of sal forests are not believed essential 

 and strip cutting is not feasible. Suggestions are made to study the growth and the relation 

 of forest and fire to the regeneration of sal. — E. N. Munns. 



252. Zimmer, Walter J. Regeneration of forests. Australian Forest. Jour. 2: 75-76. 

 1919. — A brief discussion of the suitability of the coppice method of regeneration to the 

 eucalyptus forests of Australia, which sucker very freely. — C. F. Korstian. 



GENETICS 



George H. Shull, Editor 

 James P. Kelly, Assistant Editor 



253. Abiding J. Pferdezucht und Pferderassen im osmanischen Reich. [Horse breed- 

 ing and horse breeds in the Osmanian country.] Flugschr. Deutsch. Ges. Ziichtungsk. 1918: 

 31. 47 fig. 1918. 



254. Akerman, A. Vaxternas kolddod och frosthardighet. Fdredrag vid Sveriges Ut- 

 sadesforenings extra mote under Landtbruksveckan 1919. [Winter killing and frost-resistance 

 of plants. A paper read at a special meeting of the Swedish Seed-Grain Association during the 

 "Farmers Week," 1919.] Sveriges Utsadesforenings Tidskrift 29: 61-85. 4 fig. 1919.— De- 

 tailed exposition of different theories to explain killing of plants by cooling. According to 

 experiments of Lidfors and others on the importance of sugar in protecting plants against cold, 

 it is supposable that hereditary differences in frost-resistance in different kinds of plants might 

 possibly depend on hereditary differences in sugar content. Author also has been able to 

 show that for wheat a parallelism seems to exist between sugar content and hardiness against 

 cold, in such way that plants which are more resistant to frost contain more sugar than plants 

 less resistant to frost. — In the following table four kinds of wheat are arranged in order of 

 their resistance against cold, beginning with the least resistant: 



The quantity of sugar varies much during different periods; but the sugar-curves are 

 rather nearly parallel for the different sorts of wheat. — K. V. Ossian Dahlgrcn. 



255. Allexdorf and Ehrenberg. Die Aufgaben des Sonderausschusses fur Zucker- 

 riibenbau. [Special problems of sugar-beet breeding.] Mitt. Deutsch. Landw. Ges. 1919: 

 531-534. 1919— See Bot. Absts. 5, Entry 259. 



256. Amend F. Uhtersuchungen iiber flamischen Roggen unter besonderer Beriick- 

 sichtigung des veredelten flamischen Landroggens und seiner Zuchtung. [Investigations on 

 Flemish rye with special reference to improved varieties and their breeding.] Landw. Jahrbuch. 

 52 : 614-669. 1919— See Bot. Absts. 5, Entry 260. 



