No. 3, April, 1921] GENETICS 2G5 



for half-hoary and glabrous gave 1004 plants, none hoary (and none of a fourth class possible 

 if half-hoary and glabrous were not allelomorphic). Crosses involving half-hoary-glabrous 

 heterozygotes by homozygotic glabrous gave 43 plants, none hoary (and none of a possible 

 fourth class). Data on hoary by glabrous crosses are not given in the present paper. Re- 

 viewer has omitted data from experiments in which the results were obscured. Thus, when the 

 proof for the allelomorphism of the genes under consideration depends upon the non-appear- 

 ance in a cross of a certain class other known genes for such a class must not be involved in 

 the experiment. — Edgar Altenburg. 



1831. ScHAFFNER, J. H. Dioeciousness in Thalictrum dasycarpum. Ohio Jour. Sci. 20: 

 25-34. Dec, 1919. — ^This form is dioecious, but sex intermediates of any grade can be found 

 in the field. Same diversity among various branches of single individual. Author gives 

 phylogenetic survey of heterosporous plants, bringing out transitions from bisporangiate to 

 dioecious condition. Emphasizes hopelessness of any factorial explanation of sex in plants. 

 Discourages intimate study of sex in any single form which is not backed by appreciation of 

 its phylogenetic relationships. — Merle C. Coulter. 



1832. ScHALLMAYER, W. [German rev. of: Ziegler, H. E. Die Vererbungslehre in der 

 Biologie und in der Soziologie. Ein Lehrbuch der naturwissenschaftlichen Vererbungslehre 

 und ihrer Anwendungen auf den Gebieten der Medizin, der Genealogie und der Politik, zu- 

 gleich. 2. Aufl. der Schrift iiber die Vererbungslehre in der Biologie. Zehnter( Schluss) Teil 

 des Sammelwerkes "Natur und Staat." (Genetics in biology and sociology. A text book of 

 genetics and its applications in the fields of medicine, genealogy and political science, being 

 the 2nd edition of the work on "Genetics in biology" and tenth (concluding) part of the gen- 

 eral work "Nature and the State." xvi + 479 p., 8 partly colored pi., 114 fig. Gustav Fischer: 

 Jena, 1918. (See Bot. Absts. 2, Entries 923, 963; 3, Entry 1513.) Arch. Rass.- u. Gesell- 

 schaf tsbiol. 13 : 204^208. 1920. 



1833. ScHiNDLER, Franz. Handbuch des Getreidebaus auf wissenschaftlicher und 

 praktischer Grundlage. [Handbook of grain culture on scientific and practical principles.] 

 2nd ed., i + 491 p., 130 fig. Paul Parey: Berlin, 1920. 



1834. Schmidt, Johs. Racial investigations. III. Experiments with Lebistes reticulatus 

 (Peters) Regan. Compt. Rend. Trav. Lab. Carlsberg 14^: 1-18. 1919. 



1835. ScHWEisHEiMER, W. Bevolkerungsbiologische Bilanz des Krieges 1914/19. [Popu- 

 lational effects of the war 1914-1919.] Arch. Rass.- u. Gesellschaftsbiol. 13: 176-193. 1920. 



1836. Seiler, J. Geschlechtschromosomen-Untersuchungen an Psychiden. I. Experi- 

 mentelle Beeinfiussung der geschlechtsbestimmenden Reifeteilung bei Talaeporia tubulosa 

 Retz. [Sex chromosome investigations on psychids. I. Experimental influencing of the sex- 

 determining maturation division in Talaeporia tubulosa Retz.] Arch. Zellforsch. 15: 249-268. 

 1 pi. 1920. — 'Author believes he has affected distribution of the unpaired sex ("X") chromo- 

 some by alterations in temperature and ripeness of eggs, thus influencing sex ratio. In over- 

 ripe eggs X remained in egg (cf producing) in 146 cases, went to polar body in 101 cases — 

 ratio 101 9's:144c?"s. Eggs produced under same conditions (temperature 12-16°) but not 

 overripe gave 61 9 's: 45c? 's — ratio 100 9's:74 d^'s. Warmed eggs (30-37°) gave 52 9's: 

 84 cf's— ratio 100 9 's: 162cf' s. Cooled eggs (3-81°) gave 49 9 's: 32d''s— ratio 100 9 's : 65cf 's. 

 Totals in each experiment represent from 7 to 14 clutches of eggs, in most of which the devia- 

 tion is in same direction as that of total. Ratios are based on about one-third of eggs studied; 

 in others distribution of X could not be determined. Author believes that overripe and 

 warmed eggs are "old," and that cold keeps eggs "young;" hence old eggs give excess of 

 males, young eggs excess of females. — C. W. Metz. 



1837. Seiler, J. [German rev. of: Nachtsheim, Hans. Zytologische und experiment- 

 elle Untersuchungen iiber die Geschlechtsbestimmung bei Dinophilus apatris Korsch. (Cyto- 



