PLANT HYBRIDIZATION BEFORE MENDEL 321 



2. tJber kiinstliche Kreuzung bei Pisum sativum^ Zeitschrift fiir 

 das landwirtschaftliche Versuchswesen in Oesterreich. 3 Jahr- 

 gang, Heft. 5, pp. 465-555» 1900. 



Of the three authors, priority in respect of publication of re- 

 sults lies with Hugo De Vries, then Professor of Botany at the 

 University of Amsterdam (now retired), in his paper, "Das Spal- 

 tungsgesetz der Bastarde," constituting Article No. 11 of Vol. 18, 

 of the Berichte der deutschen botanischen Gesellschaft. (Received 

 for publication March 14, 1900.) 



The second in order of publication was that of Professor Carl 

 Correns, then Professor of Botany at the University of Tubingen, 

 now Director of the Kaiser Wilhelm Institut fiir Biologic, Berlin- 

 Dahlem, in Article 19, of Vol. 18 of the Berichte der deutschen 

 botanischen Gesellschaft. (Received for publication, April 24, 

 1900.) 



Third in publication was the paper of Dr. Erich von Tscher- 

 mak, now Professor in charge of the Lehr-Kanzel fiir Pflanzen- 

 ziichtung, at the Hochschule fiir Bodenkultur at Vienna ; pub- 

 lished in Vol. 18, pp. 232-9, of the Berichte der deutschen botani- 

 schen Gesellschaft. Received for publication June 2, 1900, and 

 followed by a paper of the same title as above, given in the 

 Zeitschrift fiir das landwirtschaftliche Versuchswesen in Oesterr- 

 eich, 3 Jahrgang, Heft. 5, pp. 465-555. 



Following are the statements by the three discoverers of Men- 

 del's epoch-making paper of investigation, as to the manner of 

 its discovery by them individually. These reports are in the form 

 of letters to the author, written on request, for inclusion herein. 

 The communication of De Vries is in^ English ; those of Correns 

 and von Tschermak are in German, and are translated for publi- 

 cation. A portion of the Correns report is taken from the article 

 entitled "Etwas iiber Gregor Mendel's Leben und Wirken" in Die 

 Naturwissenschaften, Jahrgang 10, Heft 29 (July 21, 1922), 

 pp. 629-31, kindly also sent by Professor Correns. Further data 

 are supplied from letters to the author. 



