PLANT HYBRIDIZATION BEFORE MENDEL 357 



Von Tschermak's final conclusion agrees with Mendel's re- 

 sults, and is stated as follows: 



"From this essential approach to the average value, there results, in my 

 judgment, the conclusion, that the combination of two dominating (or 

 recessive) characters in the one parent form results in the same rela- 

 tionship in the seed product of the hybrids, as the characters in question 

 do when isolated. An alteration of the value, or an increase of the pre- 

 valence, does not thereby enter in." (3b, p. 536.) 



This concludes the account, rather extended in detail, of the 

 three remarkable, practically simultaneous, discoveries of Men- 

 del's celebrated papers published in the year 1900. Without regard 

 to the actual precedence in respect to dates of publication, the en- 

 tirely independent and practically equal merit of the contributions 

 of the three separate investigators leaves little room for conten- 

 tion from the standpoint of the contributions themselves. The re- 

 markable fact for science of the nearly simultaneous triple re- 

 discovery of Mendel's Law dwarfs into insignificance the matter 

 of precedence therein. 



BIBLIOGRAPHY 



De Vries^ Hugo. 



(a) Das Spaltungsgesetz der Bastarde. Ber. d. d. bot. Ges. 

 18:83-90. 1900. 



(b) Sur la loi de disjonction des hybrides. Comptes Rendus 

 de I'Acad. des Sciences. Paris, 130:845-7. 1900. 



(c) tjber erbungleiche Kreuzungen. Ber. d. d. bot. Ges. 



18:435-43- 1900. 



(d) Intracellular Pangenesis. 270 pp. 8vo. Chicago, 1910. 



(e) Intracellulare Pangenesis. 212 pp. Jena, 1889. 



