10 GENETICS [BoT. Absts., Vol. X, 



and composition of the crop, the selection and development of the forest nursery site, seed 

 sowing, care of seedlings, transplanting, season of planting, spacing, planting operations, 

 planting methods, rotation, and cleanings of this important exotic species. — C. F. Korstian. 



70. Swain, E. H. E. Annual report of the Director of Forests for the year ended 30th 

 June, 1920, Ann. Progress Kept. Queensland Forest Service. 65 p. Brisbane, 1920. — This is 

 the usual routine report for the year. The work of the Service is summarized under the 

 following captions: "Prospect, retrospect, financial, forest organization, logging operations, 

 silvical investigation and experiment, forest products research, forest protection, forest survey 

 and engineering, forest reservation, the timber market, administration, interstate and imperial 

 conferences, personnel." Appendices include a report for the 6 months ended June 30, 1919, 

 the Hobart Conference, the Imperial Forestry Conference, forestry in Queensland, and reve- 

 nue. The duty of exploitation and of actually delivering the products of the state forests 

 directly from the stump to the market has been added to the Forest Service. — C. F. Korstian. 



71, Weaver, Roscoe B. The burning of dead and down trees as a practical protection 

 measure. Jour. Forest. 19: 506-511, 1921. — As a protective measure, snags and down trees 

 in western yellow pine stands in the Modoc Forest were burned during the latter part of the 

 season. After chopping a hole in the sapwood near the base, a fire is started which burns 

 the tree down in a short time. With recently killed trees, 2-inch auger holes are bored in the 

 trunk at such an angle as to intersect and in one of these a fire is started which in most cases 

 successfully drops the tree. About 2,000 acres were covered and 4,600 trees fired, averaging 

 115 trees per man per day at a cost of 6 cents per tree and 14 cents per acre. Such results are 

 of great practical value as such burning can be done about areas of high fire hazard, along 

 protection or isolation strips, along roads, and about recreation areas at a cost which makes 

 such clearing feasible. — E. N. Munns. 



GENETICS 



George H, Shull, Editor 

 J. P. Kellt, Assistant Editor 



(See also in this issue Entries 23, 162, 177, 182) 



72. Anastasia, G. Emilio. Le forme elementari della composizione del vegetali. L'ori- 

 gine della specie. (Filogenesi delle Nicotianae della Primulaceae e delle Violae. I. Le Nico- 

 tianae, [Elementary forms of the composition of plants. Origin of species. (Phylogenesis 

 of the Nicotianae, Primulaceae, and Violae. I. The Nicotianae,] Boll, Technico 1920*: J^Sp., 

 7 pi. 1920. — The author believes that A'', tabacum is a composite species comprising numerous 

 elementary forms, intermediate between species of the sections Rustica and Petuniodes of 

 G. Don. These sections are characterized not only by flower shapes as originally described 

 but by the shapes of the stigmas. A plant of a variety of N. rustica L. was crossed with pollen 

 from a garden variety of Petunia. Three seeds from this cross germinated; one produced 

 a plant which in appearance duplicated N. tabacum. The author is not disturbed by the 

 possibility of error which might be suspected from the fact that the plant was completely 

 fertile. He believes its occurrence throws much light on the origin of A'', tabacum. — E. M. 

 East. 



73, Babcock, E, B. Bud selection and the frequency of mutations. Monthly Bull, 

 Dept. Agric. California 10: 137-140. 1921. — The efficacy of bud selection as a means of im- 

 proving the type is dependent upon the occurrence of bud mutations; its practicability, upon 

 their frequency. In order to change existing varieties through bud selection, bud variations, 

 or plants grown from bud variants of a relatively permanent nature, must first be discovered. 

 Thus far data available are not sufficient to justify any conclusion regarding the practicability 

 of increasing the yield of deciduous trees through bud selection. — E, L. Overholser. 



