266 GENETICS [BoT. Absts., Vol. VIII, 



1883. Stewart, Hugh Shaw. Observations on the planting of the quicker growing coni- 

 fers. Trans. Roy. Scottish Arboric. See. 34: 141-145. 1920. — Spacing even as close as 3 feet 

 in the case of Douglas fir and Japanese larch does not prevent, and only partially restrains, 

 branch growth. If clean boles are required, hand pruning close to the stem must be resorted 

 to. Such spacing, moreover, results in the production of many suppressed boles of little 

 value which interfere with the root development of the more vigorous, dominant neighbors. 

 Spacings of 5J, 6, and 7 feet are advocated respectively for Sitka spruce, Japanese larch, 

 and Douglas fir. — C. R. Tillotson. 



1884. Stuart, J. S. Niblock. The effect of storms on certain forests in the Tsolo district, 

 Cape Province. Jour. Dept. Agric. Union of South Africa 1 : 750-754. 3 pi. 1920. 



1885. Tromp, F. J. Essential oils, with special reference to those obtained from the Euca- 

 lypts. South African Jour. Indust. 4: 85-89. 1921. 



1886. Vendelmann, Henry. Forestry by precultures. Quart. Jour. Forest. 14: 185-190. 

 1920. — Forestry by precultures has been attended with such striking success that it is being 

 widely adopted. It consists in improving the soil to such an extent that it becomes suited to 

 the varieties of trees which have been selected for planting. Improvement of the soil is 

 brought about by deep surface plowing, subsoil plowing where there is hardpan, the adding of 

 commercial fertilizers, and the growing of green manures. This is followed by an agricultural 

 crop, against which the cost of soil improvement can be charged. Some trees can be grown by 

 sowing the seed with the grain crop. In the case of others, 1 or 2-year seedlings are planted 

 following the removal of the grain, the land being in such condition that planting can be 

 carried on very rapidly. In December (shortest days of the year) an average of 8,000-9,000 

 1-year firs were planted in a day by 1 slitter and 2 boy planters. On a particular day, 1 slitter 

 and 3 boy planters put in 18,000 plants.— C. R. Tillotson. 



1887. Watt, A. S. The biological basis of forestry. Trans. Roy. Scottish Arboric. Soc. 

 34: 210-216. 1920. — The author emphasizes the need of an adequate understanding of the 

 biological factors entering into the growth of trees in stands in order to place forestry upon 

 a scientific as well as a sound economic basis and to avoid the evil results of the application of 

 imperfect knowledge. — C. R. Tillotson. 



1888. Weiss, F. E. Fibre yielding plants and their economic importance. Ann. Rept. 

 and Trans. Manchester Microsc. Soc. 1919: 25-31. 1920.— Presidential address delivered 

 February 13, 1919. A brief enumeration and description of plant tissues and parts used in 

 various portions of the world in the making of paper, cordage, and textiles. — C E. Allen. 



GENETICS 



G. H. Shull, Editor 

 J. P. Kelly, Assistant Editor 



(See also in this issue Entries 1589, 1590, 1601, 1608, 1615, 1774, 1812, 1837, 1857, 1955, 

 1962, 1967, 1972, 1974, 1975, 1990, 2012, 2091, 2104, 2194, 2263) 



1889. Anonymous. [Rev. of: Adami, J. G. Medical contributions to the study of evolu- 

 tion, xviii + 372 p., 7 pi., 18 fig. Duckworth & Co.: London, 1918.] Sci. Prog. [London] 

 13:679-681. 1919. 



1890. Anonymous. Biology of endogamy and exogamy. [Rev. of: East, E. M., and 

 D. F. Jones. Inbreeding and outbreeding: their genetic and sociological significance. 285 p. 

 J. B. Lippincott Co.: Philadelphia and London, 1919.] Nature 106: 335-336. 1920.— See 

 Bot. Absts. 4, Entry 571. 



