208 GENETICS [Bot. Absts., Vol. V, 



1572. Lotst, J. P. Heribert Nilsson's onderzoekingen over soortsvorming bij Salix met 

 opmerkingen mijnerzijds omtrent de daarin en in publicaties vanandeienuitgeoeiende kiitiek 

 aan mijn soorts-definitie. [Heribert- Nilsson's investigation on species formation in Salix with 

 remarks of my own on the author's critique, and that of others on my taxonomic definitions.] 

 Genetica 2: 162-188. Mar., 1920. 



1573. Lotsy, J. P. Cucurbita-Strijdpagen. De soort-quaestie.— Het gedrag na kruis- 

 ing.— Parthenogenese? II. Eigen onderzoekingen. [Cucurbita problems. The species ques- 

 tion. The result of crossing. Parthenogenesis? II. Investigations by the author.] Genetica 

 2: 1-21. 1 8-colored plate, 9 fig. Jan., 1920. 



1574. Luhning. Die erbliche Geschlechtsverkniipfung. [Hereditary sex linkage.] 

 Deutsch. Landw. Tierzucht, 22: 77-78. 1918. 



1575. Malinowski, Edmund. Die Sterilitiit der Bastarde im Lichte des Mendelismus. 

 [The sterility of hybrids in the light of Mendelism.] Zeitschr. indukt. Abstamm. Vererb. 22: 

 225-235. May, 1920. 



1576. Mass, J. G. J. A. Field experiments with Hevea. Agric. Bull. Federated Malay 

 States 6: 561-613. 596-597. 1918. 



1577. Masui, Kiyoshi. The spermatogenesis of domestic mammals. I. The spermato- 

 genesis of the horse (Equus caballus). Jour. Coll. Agric. Imperial Univ. Tokyo 3: 357-376. 

 S pi, 2 fig. 1919. 



1578. Masui, Kiyoshi. The spermatogenesis of domestic mammals. II. The spermato- 

 genesis of cattle (Bos taurus). Jour. Coll. Agric. Imperial Univ. Tokyo 3: 377—103. 3 pi., 

 1 fig. 1919. 



1579. Matthael, R. [German rev. of: Klatt, B. Experimentelle Untersuchungen iiber 

 die Beeinfiussbarkeit der Erbanlagen durch den Korper. (Experimental investigations on 

 the modifiabiiity of the hereditary factors through the soma.) Sitzungsber. Ges. Naturf. 

 Freunde 1919: 39-45. 1919. See Bot, Absts. 5, Entry 1546.] Zeitschr. Allg. Physiol. 18: 

 46-47. 1920. 



1580. McAlpine, D. Immunity and inheritance in plants. Advisory Council Sci. Indust. 

 Australia Bull. 7: 76-86. 1918. — A general discussion of the inheritance of disease resistance 

 in wheat. Author recommends crossing susceptible varieties with resistant ones as means 

 of developing rust immunity. — J. H. Kempton. 



1581. Mendel, Kurt. Familiare peripherische Radialislahmung. [Familial peripheral 

 paralysis of the radial nerve.] Neurol. Cent ralbl. 39: 58-59. 1920. — It is recognized that hered- 

 ity often plays a role in cases of facial paralysis, but it has not been determined whether 

 the manifestation in these cases is due to the indirect effect of some hereditary anatomical 

 anomaly, such for example as an unusually acute bend in the facial canal, or to a heightened 

 susceptibility inherent in the nerve itself. The author now reports a family in which the 

 father and two sons suffered from paralysis of the hand following very trivial injuries to the 

 radial nerve at the elbow or near the shoulder. From these cases the author is led to believe 

 that in hereditary paralysis involving the radial, probably the facial, and possibly other pe- 

 ripheral nerves, the underlying factor is to be sought not in any gross anatomical variation of 

 the related parts, but in an hereditary condition of increased vulnerability of the particular 

 nerve involved in the paralysis. — C. H. Danforlh. 



1582. Metz, Chas. W. Correspondence between chromosome number and linkage groups 

 in Drosophila virilis. Science 51 : 417-418. April 23, 1920.— Whereas in Drosophila mclano- 

 gaster there are three large pairs and one very small pair of chromosomes, and three large 

 groups and one very small group of linked genes, there are in D. virilis five large pairs, and one 



