Cytologie und Befruchtung. — Descendenz. 291 



obliteriren. Diese vegetativen Kerne fehlen dem jüngst vom Verf. 

 studirten Taphridium, bei dem auch keine Kopulation der Bildung des 

 Sporangiums vorausgeht. 



Zum Schluss vergleicht Verf. die Entwickelung von Dipodascus mit 

 der der Phycomyceten und Ascomyceten. Er weist auf die Analogie der 

 vegetativen Kerne mit denen des Oogons von Albugo Candida und 

 anderen Peronosporeen hin 



Er hebt mit Recht hervor, dass das Karpogon von Dipodascus nicht 

 dem einzelnen Ascus noch der der Kerntheilung vorausgehenden Kern- 

 fusion entspricht, da bei Dipodascus nur ein Kern des Pollinods und 

 einer des Carpogons mit einander copuliren. Der Sporenschlauch von 

 Dipodascus entspricht daher der ganzen aus dem befruchteten Carpogon 

 eines Ascomyceten hervorgehenden ascogonen Hyphe mit den Asken, der 

 ganzen Ascus-Püanze oder y4sc«s-Generation. P. Magnus (Berlin). 



BATESON, W., Mendel's Principles of Heredity. (Univer- 

 sity Press. Camdbridge 1902. 212 pp.) 



This volume is an elaborate defence of Mendel's results 

 against the criticisms of Prof. Weldon (see above). vines. 



Bateson, W. and Saunders, E. R., Experimental St u dies 

 in the Physiology of Heredity. (Reports to the Evolu- 

 tion Committee of the Royal Society of London. Report I. 

 1902. 160 pp.) 



The authors give an account of experiments with certain 

 plants, and with poultry. 



The plants used for crossing were hairy and glabrous 

 varieties of Lychnls vespertina and of L. diurna ; Atropa Bella- 

 donna and A. Belladonna var. lutea a variety with yellow 

 flowers and fruits and green stems; Datlira Stramonium, 

 D. Stramonium var. inermls ; D. Tatula, and D. Tatula var. 

 inermis ; several annual and biennial varieties of Stocks (Mat- 

 thlola). 



With regard to Lychnls, Atropa and Datum, the authors 

 conclude that „as in Lychnls and probably also in Atropa, we 

 have obedience to the Mendelian law in the case of a Single 

 pair of antagonistic characters, so in Datlira we have a similar 

 result for the more complicated case in which two such pairs 

 of characters are concerned". 



With regard to Matthtola „the results obtained are so 

 complex that it is difficult to draft Statements which shall give a 

 precise and comprehensive view of the phenomena", „Speaking 

 generally, the results here detailed agree well with those of 

 Correns: but owing to the use of a large number of types, 

 our results are necessarily much more complex". 



The paper concludes with a discussion of the facts of here- 

 dity in the light of Mendel's discovery. Vines. 



Weldon, W. F. R., Mendel's Laws of Alternative In- 

 heritance in Peas. (Biometrika. Vol. I. No. 2. January 

 p. 228—254.) 



19* 



