122 GENETICS [Bot. Absts., Vol. IV,. 



750. Simons, A. Familiare Trommelschlegelbildung und Knochenhypertrophie. [Familial 

 formation of drumstick fingers and hypertrophy of the joints.] Deutsch. Zeitschr. Nerven- 

 heilk. 59: 1918. 



751. Sirks, M. J. De erfelykheidsbeschouwingen van Carl von Naegeli. (1817-1891.) 

 [Carl von Naegeli's (1817-1891) conceptions of heredity.] De Tydspiegel. 75: 2G5-283. 

 1918. — The greater part of modern botanists and geneticists know Naegeli's conceptions 

 of heredity only from his most important work: Mechanisch-physiologische Theorie der 

 Abstammungslehre. But the philosophical manner of treatment in this work, denied 

 by Naegeli himself as being a well-founded way, is notwithstanding a hindrance for right 

 appreciation of his attitude towards the problems of evolution; his earlier papers (published 

 in Sitzungsberichte kon. Akad. d. Wissensch. Munchen, 1S65, 1866, 1872, 1874 and Entstehung 

 und Begriff der Naturhistorischen Art. Munchen. 1865) give us a widely different opinion about 

 his conceptions. Naegeli in these years was a sharp anti-Lamarckian; though being a florist, 

 he could not agree with the general florists' opinion of the origin of new species and varieties 

 by acclimatization. A fundamental difference between species and varieties does not exist 

 in his opinion; their origin is of the same character. He makes in these previous papers a 

 beginning with development of his "idioplasma"-theory; it is still in embryonal form and its 

 further building has not yet begun. That is a great profit of these papers; the mystical "Ver- 

 vollkommnungstrieb" of his later conceptions has not yet been born. Instead of this he seeks 

 a rich source of new varieties in hybridization; he knows the variability of F 2 generations 

 though, perhaps as a result from the misleading hybridization-experiments in Hieracium, he 

 did not think this hybridization was a factor in the evolutionary process. His original papers 

 before 1875 contain much more sane and critical remarks than did his greater work of 1884. 

 — M. J. Sirks. 



752. Sirks, M. J. [Dutch rev. of: Durken, Bernhard. Einfiihrung in die Experimental- 

 zoologie. (Introduction to experimental zoology.) x-\- 446 p.,2%4 fig- Julius Springer: Berlin, 

 1919.] Genet ica 2: 55-58. Jan., 1920. 



753. Sirks, M. J. [Rev. of Honing, J. A. Een steriele dwergform van Deli-tabak, on- 

 staan als bastaard. (A sterile dwarf form of Deli tobacco originated as a hybrid.) Bull. Deli- 

 proef. Medan. Sumatra 10: 24 p., 8 pi, 1917.] Zeitschr. indukt. Abstamm. Vererb. 22: 60. 

 Dec, 1919. 



754. Sirks, M. J. [Dutch rev. of : Houwink, R. Hzn. Erfelijkheid. Populaire beschou- 

 wingen omtrent het tegenwoordige standpunt der erfelijheid, verzameld uit theorie en practijk. 

 (Heredity. Popular presentation of the present status of heredity compiled from theory and 

 practice.) Assen. Stoomdrukkerrij Floralia 1919: 1-62. 5 pi., 1919.] Genetica 2: 63. Jan., 

 1920. 



7.1.1. Sirks, M. J. [Dutch rev. of: Kajanus, B. Genetische Studien iiber die Bliiten von 

 Papaver somniferum L. (Genetical studies on the flowers of Papaver somniferum L.) Ark. 

 Bot. K. Svensk. Vetenskapsakad. 15: 1-87. 3 pi. 1919.] Genetica 2: 64-65. Jan., 1920. 

 —See Bot. Absts. 3, Entry 2147. 



756. Sirks, M. J. [Rev. of: Kajanus, B. Elementar arftlighet lara. [Elementary 

 genetics.) 88 p. P. A. Norstedt and Soner: Stockholm, 1917.] Genetica 1: 555. Nov., 1919. 



757. Sirks, M. J. [Dutch rev. of: Kammerer, P. Vererbung erzwungener Formveran- 

 derungen. 1. Die Brunftschwiele des Alytes-Mannchen aus "Wassereiern." (Inheritance of 

 induced changes of form. 1. The callosities of the Alytes males from "water-eggs.") Arch. 

 Entwicklungsmech. Org. 45: 323-370. PI. 10-11. 1919.— Mac-Bride, E. W. The inheritance 

 of acquired characters. Nature 103: 225. May 22, 1919. — Bateson, W. Dr. Kammerer's 

 testimony to the inheritance of acquired characters. Nature 103: 344-345. July 3, 1919.] 

 Genetica 2: 05-67. Jan., 1920.— See Bot, Absts. 4, Entry 732. 



