45(3 Vererbung, Variation, Mutation. 



in the record. Black X chestnut gives 32% chestnut, 22^0 black, 6% brown 

 and 40% bay. The results for brown X chestnut and baj' X chestnut are also 

 given. As a result of these and other data it is concluded that chestnut is hy- 

 postatic to all other colours. Many other data of colour inheritance are given, 

 and the colours are placed in the following series : Chestnut (C) hypostatic to all 

 others; black (Bl) epistatic to C but hypostatic to brown (Br), which in turn is 

 hypostatic to bay (B). Gray (G) and roan (R) are epistatic to ß, and perhaps 

 hypostatic to white (W). Dun (D) is unplaced but is near the top of the series 

 with G and R. Gates. 



1205) Kamaley, F., Inheritance of left-handedness. In: Amer. Natural, 

 Bd. 47, S. 730—738, 1913. 



The paper includes a study of left-handedness in 610 parents and 1130 

 children, the data being collected from students at the University of Colorado. 

 It is concluded that left-handedness is a Mendelian recessive, the condition pro- 

 bably existing in about one-sixth of the population. It is suggested that the 

 Mendelian types niay exist in the ratio 9 homozygous right-handed : 12 hetero- 

 zygous right-handed : 4 left-handed. There are difficulties sometimes in distin- 

 guishing between "natural" and "acquired" left-handedness. Gates. 



1206) Leilbkiüd, Ein Fall von Keratoma palmare et plantare heredi- 

 tarium. In: Münchn. med. Wochenschr., 61. Jahrg., Nr. 5, S. 270, 1914. 



Ein 31 jähr. Glasbläser weist von Geburt an symmetrisch an Hohlhänden 

 und Fußsohlen lokalisierte hyperkeratische, dem Relief der Haut entsprechende, 

 von einem erythematösen Hof umgebene Plaques auf. Differentialdiagnostisch 

 unterscheidet sich das Krankheitsbild von einer ungewöhnlich lokalisierten Ich- 

 thyosis durch den erythematischen Hof und von der Keratodermie symmetrique 

 palmaire et plantaire Besniers durch die Kongenitalität. Ob der Fall mendelt 

 muß noch festgestellt werden; vorläufig wird berichtet, daß die Großmutter 

 mütterlicherseits, die Mutter, zwei Brüder der Mutter (unter sieben Geschwistern), 

 und ein Bruder des Mannes (unter fünf Geschwistern) an derselben Affektion 

 litten. Weishaupt. 



1207) Weinberg, "W., Kurzsichtigkeit und Erstgeburt. In: Arch. Rass.-Ges. Biol., 

 Bd. 10, Heft 3, S. 326—327, 1913. 



1208) Leuz, F., Noch einmal die Erblichkeit der Haemophilie und Ver- 

 wandtes. In: Arch. Rass.-Ges. Biol. Bd. 10, Heft 3, S. 332—339, 1913. 



1209) Weinberg, W., Zur Hämophilie. In: Arch. Rass.-Ges. Biol, Bd, 10, Heft 3, 

 S. 339—344, 1913. 



1210) Lenz, F., Bemerkungen zu dem vorstehenden Artikel von Weinberg. 

 In: Arch. Rass.-Ges. Biol., Bd. 10, Heft 3, S. 344—346, 1913. 



1211) Orassl, J., Zum Generationswechsel. In: Arch. Rass.-Ges. Biol., Bd. 10, 

 Heft 3, S. 346 347, 1913. 



1212) Sinnott, E. W., The fixation of character in organisms. In: Amer. 

 Natural., Bd. 47, S. 705—729, 1913. 



Classification of organisms is made possible by the fact that certain charac- 

 ters remain relatively fixed in Evolution, while others are modified. It is very 

 important to ascertain the causes of these differences in variability. The invari- 

 able presence of segments in Articulata, tracheae in Insects, feathers in birds, 



