386 Ö. Vererbungslehre. 



1058) Rudow, A., Einige Mißbildungen an Käfern. 



(Intern, entom. Zeitschr. Guben 5,15. p. 111. 5 Abb. 1911.) 



Es werden fünf abweichende Fühlerbildungen bei Käfern beschrieben und 

 abgebildet. Bei zwei (j*(f von Polyphylla fullo ist bei einem der rechte, bei 

 dem anderen der linke Fühler nur x / 4 so lang wie der der entsprechenden 

 anderen Seite, ohne aber weibliche Bildung zu zeigen. 



Zwei 0*0* von Melolontha vulgaris weisen auf der rechten Seite der eine 

 zwei, der andere drei Fühlerkeulen auf, die überzähligen Bildungen entspringen 

 bei beiden am dritten Gliede des ursprünglichen Fühlers. Bei einem Exem- 

 plar von Orinocarabus silvestris zweigt sich vom fünften Gliede des rechten 

 Fühlers ein zweiter von acht Gliedern ab. Zwei der Tiere wurden schon kurz 

 von Elkner (1. c. 3,41) erwähnt. P. Schulze (Berlin). 



6. Vererbungslehre. 



(Siehe auch Nr. 907, 908, 981, 997, 1019, 1021, 1047, 1076, 1078, 1079, 1094, 1099.) 



1059) Punnett, R. C. (Cambridge University), Mendelism. (Third Edi- 

 tion.) 8°. pp. XIII and 176. 35 figures and 7 plates. Macmillan & Co. 

 London 1911. 



This book, although called the third edition of Prof. Punnett 's „Men- 

 delian", is in reality a completely new work. It is about four times as large 

 as the second edition of 1907, is enriched with a number of excellent figures 

 and seven plates, five of them admirably produced in colour, and deals with 

 the subject in an altogether more complete manner. The earlier part of the 

 book treats the subject in the same way as the former editions, but more 

 fully; much of the latter part is entirely new, and is devoted to the more 

 recent developments of Mendelian theory and the discoveries of the last four 

 years. The difference between this book and its predecessor is a striking 

 illustration of the progress that has taken place in this short space of time, 

 a progress which is largely due to the combined work of Professor Bateson 

 and the author. The chapters in which the greatest amount of new matter 

 is included are the following. That on Dominance discusses cases in which 

 the heterozygote is intermediate between the two homozygous. forms, domi- 

 nance as affected by sex, as in the horns of sheep, and irregulär or alter- 

 native dominance. In considering the relation between wild and domestic 

 varieties it is concluded that domestic races may arise by either the addition 

 or substraction of factors, but that as far as is known at present, the kinds 

 of factors which may be added are somewhat limited. The chapter on ga- 

 metic coupling and repulsion contains interesting new matter, especially the 

 fact, which was first published simultaneously with the book, that if two fac- 

 tors are coupled in the gametes of a heterozygote when both are introduced 

 from one parent, they exhibit repulsion when one is introduced from one 

 parent, the other from the other parent. The various ratios in which coupling 

 occurs, and the general formulae which express them, are given in an appen- 

 dix to this chapter. Two chapters are devoted to sex and its relation to 

 Mendelian phenomena, the cases most fully discussed being those of Abraxas, 

 the Silky Fowl, Bryonia dioica and alba, and the inheritance of double- 

 ness in Stocks (Matthiola). [No very füll discussion is given of the various 

 hypotheses which have been suggested with regard to the male and female 

 determining factors, and the scheme which the author seems inclined to adopt 

 (male = Mmff, female = Ffmm, M being male determines, F female deter- 



