No. 1, July, 1920] GENETICS 123 



75S. Sihks, M. J. [Dutch rev. of: MacLeod, J. The quantitative method in biology. 

 16 X 88 cm., v + 888 p., 87 fig. Longmans, Green & Co.: New York. L919.] Genetica2:69-71. 



Jan., 1920. 



759. SlRK8, M. J. [Rev. of :MateR-Gmblin, H. Mededeelingenomtrentenkele kruisings 

 en veredelingsproefnemingen. (Reports on several experiments in crossing and selection.) 

 Gultura 30: 1-19. JL pi. VMS. (Sec also Bot. Absts. 4, Entry 675.)] Zeitschr. indukt. Ab- 

 Btamm. Vererb. 22: 60-61. Dec, 1919. 



7G0. Sirks, M. J. [Rev. of: Reiners, J. II. In. De studie der afstammingen der bloed- 

 lynen en de karakteristiek van onze rundveerassen. (The study of descendance and blood- 

 lines and the characteristics of our races of cattle.) Cultuni 30: 328-353. 1918.] Zeitschr. 

 indukt. Abstamm. Vererb. 22: 63. Dec, 1919. 



Till. Sirks, M. J. [Dutch rev. of: Schmidt, Johannes. Der Zeugungswert des Indi- 

 viduums beurteilt nach dem verfahren kreuzweiser Paarung. (Individual potency based on 

 experience in crossmatings.) 8vo., 40 p. Gustav Fischer: Jena, Germany, 1919. (See B<j1 . 

 Absts. 3, Entry 2190.)] Genetica 2: 82-S3. Dec, 1919. 



762. Sirks, M.J. [Rev. of : Tammes, T. De veredeling van het vlas in Nederland. (Flax 

 breeding in Holland.) Mededeel. Ver. Wetenschapp. 9: 19 p. 1918. (See Bot. Absts. 3, 

 Entry 1519.)] Zeitschr. indukt. Abstamm. Vererb. 22: 61-62. Dec, 1919. 



763. Sirks, M. J. [Dutch rev. of : Thomson, J. A. Heredity. 3rd ed., 627 p., 47 fig. J. 

 Murray: London, 1919.] Genetica 2: 85-87. Jan., 1920. 



764. Sirks, M. J. [Rev. of: Tjebbes, K., and H. N. Kooiman. Erfelykheidsonderzoe- 

 kingen by boonen. (Gcnetical experiments with beans.) Genetica 1: 323-346. 1919.] (See 

 also Bot, Absts. 3, Entry 1041.) Zeitschr. indukt. Abstamm. Vererb. 22: 63-64. Dec, 1919. 



765. Sirks, M. J. [Rev. of: van Herwerden, M. A. De terugkeer van een sedert zeven 

 jaar verdwenen kenmerk in een cultuur van Daphnia pulex. (The return of a characteristic 

 which had disappeared for seven years in a culture of Daphnia pulex.) Genetica 1: 321-322. 

 1919. (See also Bot. Absts. 3, Entry 1043.)] Zeitschr. indukt. Abstamm. Vererb. 22:62-63. 

 Dec, 1919. 



766. Sirks, M. J. [Dutch rev. of: van der Wolk, P. C. Onderzoekingen over blyvende 

 modificaties en hun betrekking tot mutaties. (Researches on permanent modifications and 

 their relations to mutations.) Cultura 31: 82-105. 1 p. 1919. (See Bot. Absts. 3, Entry 

 296: 4, Entry 767.)] Genetica 2: 94-96. Jan., 1920. 



767. Sirks, M. J. [Rev. of: Van der Wolk, P. C. Onderzoekingen over blyvende modi- 

 ficaties en hun betrekking tot mutaties. (Experiments on persistent modifications and their 

 relations to mutation.) Cultura 31: 82-105. 1919. (See Bot. Absts. 3, Entry 296; 4, Entry 

 766.)] Zeitschr. indukt, Abstamm. Vererb. 22: 5S-60. Dec, 1919. 



768. Sirks, M. J. [Dutch rev. of : Winge, 0. On the non-Mendelian inheritance in varie- 

 gated plants. Compt. Rend. Trav. Lab. Carlsberg 14: 1-20. 4 fig. 1919. (See Bot. Absts. 3, 

 Entry 306.)] Genetica 2: 91-92. Jan., 1920. 



769. Sirks, M. J. [Dutch rev. of : Winge, 0. On the relation between number of chromo- 

 somes and number of types, in Lathyrus especially. Jour. Genetics 8: 133-13S. PL 5. Apr., 

 1919. (See Bot. Absts. 3, Entry 307.)] Genetica 2: 92-93. Jan., 1920. 



770. Slocum, R. R. Breeding poultry for standard and utility values. Reliable Poultry 

 Jour. 26: 57, 103, 104. 4 fig- 1919. — Author states that there has been a tendency among poul- 

 try breeders to split into two factions, — the fancy and the utility breeders. The reasons for 



