212 GENETICS [Box. Absts., Vol. V, 



1606. Pleijel, C Valeriana excelsa Poir X officinalis L. nova hybrida. [Valeriana ex- 

 celsa Poir X officinalis L. a new hybrid.] Bot. Notiser 1918: 29.5-296. 1918. 



1607. Popenoe, Paul. Inbreeding and outbreeding. [Rev. of: East, E. M., and D. F. 

 Jones. Inbreeding and outbreeding. 14 x 21 cm., 285 p., 46 fig. J. B. Lippincott: Philadel- 

 phia, 1919. (See Bot. Absts. 4, Entry 571; 5, Entries 437, 1695.)] Jour. Heredity 11: 

 125-128. Mar., 1920. 



1608. Popenoe, Paul. World-power and evolution. Jour. Heredity 11: 137-144. Mar., 

 1920. 



1609. P[openoe], P. Lock's last work. [Rev. of: Lock, R. II. Recent progress in the, 

 study of variation, heredity, and evolution. Ath ed., 336 p. E. P. Dutton & Co.: New York, 

 1916.] Jour. Heredity 11: 110. Mar., 1920. 



1610. P[openoe], Paul. Morgan on heredity. [Rev. of : Morgan, Thomas Hunt. The 

 physical basis of heredity. 14x21 cm., 300 p., 117 fig. J. B. Lippincott Co.: Philadelphia, 

 1919.] Jour. Heredity 11: 144. Mar., 1920. 



1611. P[openoe], P. [Rev. of: Punnett, Reginald Crundall. Mendelism. 5th ed., 

 13x19 cm., 219 p., 7 pi, 52 fig. Macmillan & Co.: London. 1919.] Jour. Heredity 11: 115. 

 Mar., 1920. 



1612. Pridham, J. T. Oat and barley breeding, agricultural research in Australia. Ad- 

 visory Council Sci. and Ind. Commonwealth of Australia, Bull. 7: 22-3S. 191S. — Cross was 

 made between the Algerian variety of oats and Carter's Royal Cluster. The F 2 consisted of 

 1,092 plants. There was great diversity among the young plants, some having coarse, broad 

 leaves, while others had leaves almost like rye-grass in their fineness. There was also great 

 diversity in character of stooling, foliage color, and habit of growth (erect or prostrate). 

 On approaching maturity some plants showed pink or reddish color at base of stalk, a charac- 

 teristic of the Algerian parent. 32.48 per cent of the plants exhibited the reddish straw, a 

 percentage considered by the author to conform with a Mendelian ratio. The grain was 

 of varying shades of brown, except in a few plants which produced yellow seeds, but no plants 

 were found with white seeds like those of the male parent. — Four crosses were made between 

 varieties of the Algerian type and those of the tree "class" and one cross was made between 

 Algerian and a "side" oat. The Fi plants were intermediate in character and of pronounced 

 vigor. In subsequent generations from oat crossbreds of the "tree" or branching type, no 

 individuals of the "side" type were found. — Attempts were made to cross Avena fatua with 

 the Algerian variety and also with Chinese skinless, but without success. — A cross was ef- 

 fected between a "false wild oat" resembling A. fatua and white Bonanza. The progeny 

 had slender straw, pale foliage and the open thin head with drooping branches of the wild 

 oat. The line was not pursued further as no individuals of promise were found. — The most 

 successful cross from the standpoint of the production of new varieties is white Ligowo X 

 Algerian. From this cross sprang "Guyra," "Lachlan," and other strains of merit which have 

 not yet been named. It is stated that the most productive varieties are those with stout awns 

 and the value of skinless varieties is deprecated. — Seeds of various oat varieties and cross- 

 breds were taken from Cowra and planted at Longerenong College, Victoria. In selections 

 of these grown again at Longerenong striking variations were found in the Algerian oats. 

 Among these were several plants with very coarse awns, very tall straw, white, large grain, 

 and a limited number of stalks. These plants ripened unusually early. The possibility of 

 the seed having been mixed was considered but no plants resembling these were found in 

 other plots. This variation with a few individual exceptions bred true in succeeding years 

 and was named "Sunrise" on account of its earliness. — A remarkable plant was found in Chi- 

 nese skinless oats at Cowra in 1913. In addition to being much earlier than the other plants 

 the early stools bore heads on which the upper flowers were like the skinless oat (three to 

 five flowers to a spikelet) while the lower flowers resembled Algerian (two flowers to a spikelet 



