94 GENETICS [Bot. Absts. 



for the various j^ears of the test. Of the eight varieties of the Japanese type studied, seven 

 were self-sterile, and one partly self-fertile. Of the nine varieties of the European type 

 studied, three were clearly self-sterile and the others were somewhat uncer ain. Varieties 

 of each type effectively cross-pollinate one another when respective blossoming periods are 

 coincident, [See Bot. Absts. 2, Entry 727.]— C. E. Myers. 



636. Hunter, C apt. H. The improvement of the barley crop. Jour. Dept.Agric. Ireland 19: 

 139-159.. Fig. 1-11. 1919. The greater part of this paper is a description of methods for per- 

 forming (1) a progeny performance-test of pure lines derived from commercial varieties of bar- 

 ley and (2) the extraction of desirable commercial types from crosses of strains containing 

 valuable characters of which a recombination is desired. Selected cases of improved pure lines 

 of Archer and Goldthorpe varieties isolated in the progeny performance-test are cited. The 

 hybridization work consists of crosses of Archer, Goldthorpe and Spratt varieties of barley. 

 Selections of plants carrying a recombination of the two parent types were made and tested 

 for length of straw, yield and nitrogen content. Photographs and descriptions of isolated 

 strains which proved worthy are given. In a cross of Archer X Spratt, the broad- and narrow- 

 eared character is followed through three generations. The broad-eared type behaves as a 

 recessive to the narrow-eared. — John W. Gowen. 



637. Jones, W. N. On the nature of fertilization and sex. New Phytol. 17: 167-188. 

 1918— See Bot. Absts. 3, Entries 612, 1486. 



638. Jordan, David Starr. War and genetic values. Jour. Heredity 10:223-225, 

 May, 1919. 



639. Kempton, J. H. Inheritance of waxy endosperm in maize. U. S. Dept. Agric. Bull. 

 754. 99 p., 14 fig. June 26, 1919.— See Bot. Absts. 3, Entry 2154. 



640. Kottur, G. L. Note on protecting the cotton flowers from natural crossing. Poona 

 Agric. Coll. Mag. 9: 131-132. 3 fig. 1918.— See Bot, Absts. 3, Entry 2156. 



641. Kraus, E. J., and H. R. Kraybill. Vegetation and reproduction with special refer- 

 ence to the tomato (Lycopersicum esculentum). Oregon Agric. Exp. Sta Bull. 149. 90 p., 22 

 fig. 1918— See Bot. Absts. 1, Entry 1402; 3, Entry 1488. 



642. Lankester, Sir Rat. The terminology of parthenogenesis. Quart. Jour. Microsc. 

 Sci. 63: 531-536. Apr., 1919— See Bot, Absts. 3, Entry 1010. 



643. Laughlin, H. H. Population schedule for the census of 1920. Jour. Heredity 

 10: 208-210. May, 1919. 



644. Levine, Michael. Life history and sexuality of Basidiomycetes. [Rev. of: Ben- 

 satjde, Mathilde. Recherches sur le cycle evolutif et la sexualite chez le Basidiomycetes. 

 [Researches on the evolutive cycle and sexuality in the Basidiomycetes.] 156 p., pi. 1-8, fig. SO. 

 [Dissertation.] Nemours, 1918. [Bot. Absts. 3, Entry 597.] Bot. Gaz. 68: 67-68. July, 

 1919. 



645. Lombarteix, Jean Marie. Les semis comme moyen de combattre la degenerescence 

 de la pomme de terre. [Seeds as means of combatting degeneration in the potato.] Rev. 

 Hortic. 90: 170. Oct., 1918 — Author states that in France the old varieties of potatoes are 

 degenerating. Not only is yield reduced but the plants are becoming more susceptible to dis- 

 ease. This degeneration is attributed to continued vegetative propagation which results in 

 reduction of vigor and consequent loss of disease resistance. It is held that, in all species 

 which may be propagated by both seeds and cuttings, seedlings are more vigorous than plants 

 propagated vegetatively. — It was found that vigor, yield and disease resistance were restored 

 completely by using for seed potatoes the tubers produced by plants grown from seed. The 

 varietal characteristics of the potatoes secured by this method closely resembled those of the 

 parental variety. — ./. //. Kempton. 



