94 GENETICS [Bot. Absts., Vol. VI, 



670. Frtjwirth, C. Handbuch der landwirtschaftlichen Pflanzenziichtung. 3. Die Zuch- 

 tung von Kartoffel, Erdbirne, Lein, Hanf, Tobak, Hopfen, Buchweizen, Hiilsenfruchtern und 

 kleeartigen Futterpflanzen. [Handbook of agricultural plant breeding. 3. The breeding of 

 potatoes, Jerusalem artichokes, flax, hemp, tobacco, hops, buckwheat, legumes and clover- 

 like forage plants.] 3rd ed., 240 p., 45 fig. Paul Parey: Berlin, 1919. — See also Bot. Absts. 6, 

 Entry 725. 



671. Galant, S. Uber die Entstehung von Variationen bei Anemone hepatica. [Origin 

 of variations in Anemone hepatica.] Biolog. Zentrabl. 39: 529-535. Dec, 1919. 



672. Gillies, C. D. Variation of sepals of Bruguiera Rheedii Blume. Proc. Roy. Soc. 

 Queensland, 30: 95-96. 1918. [Issued Dec. 21, 1918.] 



673. Goldschmidt, Ri chard. Die quantitative grundlage von Vererbung und Artbildung. 

 [The quantitative basis of heredity and species formation.] 163 p., 28 fig. Julius Springer: 

 Berlin, 1920. 



674. Hadley, Philip, and Dorothy W. Caldwell. Studies on the inheritance of egg- 

 weight. I. Normal distribution of egg-weight. Rhode Island Agric. Exp. Sta. Bull. 181. 64 

 p., 43 fig. Jan., 1920. — An unselected, homogeneous group of 39 White Plymouth Rock pul- 

 lets was the original stock, to which no new blood was added. These were subsequently 

 divided into a large-egg, and small-egg group. Individual hens showed a marked conserva- 

 tion in the weight of their eggs. The first eggs in a laying year were smaller than those which 

 followed, a maximum being reached in April, a minimum in July or August, a second maximum 

 in September and a second minimum in November or December. In and after the fourth 

 laying year the mean egg-weight continued to decrease during the eight years. The results 

 were inconclusive regarding the relation between body-weight and egg-weight. No correla- 

 tion was shown between body-weight and total egg-weight. There was a tendency for hens 

 possessing higher mean egg-weights and heavier "maximum" eggs to produce a first egg of 

 greater weight. — B. L. Hartwell. 



675. Hagiwara, Tokio. On the coupling of two leaf characters in the Japanese morning 

 glory. Bot. Mag. Tokyo 34: 17-18. 3 tables. Mar., 1920. — Describes crosses between a race 

 with variegated up-rolled leaves with two others with flat green leaves. Variegation and 

 rolling are due to recessive factors but show a certain degree of coupling. Taken separately 

 each gives a very close approximation to a 3: 1 ratio but considered together the numbers were 

 as follows: — 252 flat green : 26 rolled green : 27 flat variegated : 69 rolled variegated, where the 

 expectation on the basis of complete independence would have been for a 9:3:3:1 ratio. The 

 numbers actually found are thought by the author to accord well with the assumption of a 

 gametic gatio of 7:1:1:7 (after Bateson and Punnet's hypothesis), which would theoreti- 

 cally yield 258.4 flat green: 21.7 rolled green: 21.7 flat variegated: 70.4 rolled variegated. 

 Crossover percentages are not calculated or in fact considered. — Leonas L. Burlingame. 



676. Harland, S. C. Studies of inheritance in cotton. I. The inheritance of corolla 

 colour. West Indian Bull. 18: 13-19. 1920. 



677. Harrison, J. W. Heslop. Genetical studies in the moths of the geometrid genus 

 Oporabia (Oporinia) with a special consideration of melanism in the Lepidoptera. Jour. 

 Genetics 9: 195-280. 13 fig. Feb., 1920. — The heath-feeding geometrid subspecies Oporabia 

 filigrammaria (37 pairs of chromosomes) was derived from O. autumnata (38 pairs of chromo- 

 somes) of birch, alder, larch or pine. "This event was caused during the Glacial period by the 

 action, direct and indirect of changed climatic conditions." Eggs of the heather insect hatch 

 much earlier in the spring and imagines appear a month earlier; its larva) may be raised on the 

 food plants of the other species, but are never found upon moorland birch, alder, larch. The 

 preference for heather is due to "long years of compulsory oviposition on these plants" that 

 "have so affected the organism that the habit has been impressed germinally." Raised on 



