No. 3, October, 1921] GENETICS 203 



1297. Raltzer. [Cicrman rov. of: IIkrtwio, Paula. Haploide und diploide Partheno- 

 genese. (Haploid and diploid parthenogenesis.) Biol. Centralhl. 40: ll.')-]74. 1020 (see Bot. 

 Absts. 6, Entry 1695).] Zeitschr. Indukt. Abstamm.- u. Vererb. 26: 180-lSl. 1921. 



1298. Baltzer. [German rev. of : Levy, Fritz. Die Kernverhaltnisse beiparthenogene- 

 tischen Froschen, Ein Beitrag zur Physiologie und Pathologic der Zelle. (The nuclear rela- 

 tions in parthenogenetic frogs. A contribution to the physiology and pathology of the cell.) 

 Sitzungsber. Preiiss. Akad. Wiss. Berlin 1920:417-425. 1920.) Zeitschr. Indukt. Abstamm.- u. 

 Vererb. 26: 1S1-1S2. 1921. 



1299. Barker, E. E. Relacion existente entre el cruzamiento de plantas y la agricultura. 

 [The relation existing between crossing of plants and agriculture.] Rev. Agric. Puerto Rico 

 5: 4-12. 1920. — A brief sketch is presented of the development of genetics and its practical 

 application to plant breeding problems with suggestions for specific application to Porto 

 Rican problems. — E. E. Barker. 



1300. Bateson, W. Genetic segregation. Amer. Nat. 55: 5-19. 1921. — There is a large 

 group of cases in plants in which the reduction division cannot be coincident with segrega- 

 tion. — (1) In Malihiola, all the pollen-grains of the double-throwing singles carry the factor 

 for double, while some of the egg-cells have the factor for single, others the factor for double. 

 The same is the case, mutatis mutandis, with the factors for white and cream petals. The 

 pollen-grains are uniformly sound. — (2) A comparable difference between pollen and egg- 

 cells has been demonstrated in Oenotheras, though here there are many empty pollen-grairis. — 

 (3) In Cam.panula carpatica, all the pollen-grains of a certain hermaphrodite plant, heterozy- 

 gous for blue flower, carry the factor for femaleness; and more of them carry also the factor 

 for white flower. The pollen-grains are sound. — (4) In heterozygous single Petunias, all the 

 pollen-grains carry the dominant factor for singleness; the pollen-grains are sound. — (5) 

 Begonia Davisii is a wild form with single flowers. All the pollen-grains carry the factor for 

 double flowers. Thepollengivesalldoubles when used on double varieties; single is dominant. 

 These pollen-grains are sound. — (G) A recessive strain of Linum iisitalissimum, from a cross, 

 had anthers with only occasionally a few good pollen-grains. Pollinated from 3 other varieties 

 of flax, only recessives were produced. Thus these 3 flaxes were heterozygous for the factor 

 in question, and all their pollen bore the recessive factor. — (7) A difference in the linkage 

 value for the microspores and megaspores of Pritmda sinensis is due to somatic segregation. — 

 (8) The production of certain periclinal chimeras is due to somatic segregation. — (9) In crosses 

 of rogue peas with the normal forms, the factors peculiar to the normal form are left behind 

 in the lower parts of the Fi plants, the upper parts being pure rogue. — (10) In Funaria hygro- 

 metrica, from the perigonial leaves around the antheridia, plants bearing only antheridia 

 were regenerated; while regenerations from leaves surrounding the archegonia produced 

 monoecious plants only. Thus somatic segregation can occur even in a haploid form. — (11) 

 A variegated Adiantum capillus-Veneris produced only green prothallia. The young ferns 

 raised from these prothallia were green, white, or variegated. Hence somatic segregation must 

 have occurred in the haploid tissue of the prothallia. — John Belling. 



1301. Baur, E. [German rev. of: Hagem, Oscar. Arvelighets-Forskning. En over- 

 sigt over nyere resultater. (Genetical investigation. A review of new results.) 317 p. Ashe- 

 houg & Cie.: Kristiania, 1919.] Zeitschr. Indukt. Abstamm.- u. Vererb. 26: 254. 1921. 



1302. Batjb, E. [German rev. of : Kronacher, C. Allgemeine Tierzucht. Zweite 

 Abteilung. Fortpflanzung-Variation und Selektion-Vererbung. Zweite, vermehrte und 

 durchgearbeitete Aufiage. (General animal breeding. 2nd part. Reproduction-variation and 

 selection-heredity. Second enlarged and completely revised edition.) Parey: Berlin, 

 1920.] Zeitschr. Indukt. Abstamm.- u. Vererb. 26: 176. 1921. 



1303. Baub, E. [German rev. of: Reinke, J. Kritik der Abstammungslehre. (Critique 

 of the evolution theory.) 183 p. Johann Ambrosius Barth: Leipzig, 1920.] Zeitschr. Indukt. 

 Abstamm.- u. Vererb. 26: 178-179. 1921. 



