Bd. XC. No. 10. XXIII. Jahrgang. 



Botanisches Centralblatt 



Referirendes Organ 



der 



Association Internationale des Botanistes 



für das Gesammtgebiet der Botanik. 



Herausgegeben unter der Leitung 

 des Präsidenten : des Vice-Präsidenten : und des Secretärs : 



Prof. Dr. K. Goebel. Prof. Dr. F. 0. Bower. Dr. J. P. Lotsy. 



von zahlreichen Specialredacteuren in den verschiedenen Ländern. 



Dr. J. P. Lotsy, 



Chefredacteur. 



No. 36. 



Abonnement für das halbe Jahr 14 Mark 



durch alle Buchhandlungen und Postanstalten. 



1902. 



Alle für die Redaction bestimmten Sendungen sind zu richten an Herrn 

 Dr. J. P. LOTSY, Chefredacteur, Leiden (Holland), Oude Rijn 33 a. 



Referate. 



m 



BLACKMAN , V. H. , Some recent work on Hybrids in 

 Plants. (New Phytologist. Vol. I. 1902. p. 73—80, 97 

 — 106.) 



The author reviews the history of the study of hybrids to 

 the publication in 1900 by De Vries of a paper „Sur la loi 

 du disjonction des hybrides", shortly after which De Vries, 

 Correns and Tschermak almost simultaneously discovered 

 the forgotten work of Gregor Mendel published in 1865. 

 Mendel's work (on Peas) is described and his laws discussed 

 at some length. Mendel's results have been largely confirmed 

 by Tschermak and Correns for Pea hybrids, and by 

 De Vries for some others. The view of De Vries that they 

 hold good for nearly all hybrids is erroneous. The law of 

 dominance fails for a number of hybrids and, as Mendel 

 himself recognised, it is not true for all the characters of Pea 

 races. To Mendel's law there are also striking exceptions as 

 Mendel shewed in his study of Hieracium hybrids, in the 

 second generation of which all the offspring were like their 

 parents. 



Correns' work (1901) on hybrids between the various 

 constant races of Zea Mais and on Matthlola hybrids (1900) is 

 then reviewed in connection with De Vries' Observation on 

 Oenothera hybrids and those of Tschermak on Peas and 

 Beans. The resultats of these investigators, while they extend 



Botan. Centralbl. Bd. XC. 1902. 17 



