2i8 PLANT HYBRIDIZATION BEFORE MENDEL 



p. 112), Mendel's reference to Gartner's cross of G. urhanum X 

 rivale is referred to as follows : 



"From G. urhanum X rivale Gartner appears to have raised exceed- 

 ingly fertile and constant hybrids (according to Mendel, Verh. nat. hist. 

 Ver. Briinn. IV, p. 40). I do not find this verified on the reading of the 

 original. (Bast. Erz. 698)." 



(The Mendel reference in question is found on p. 373 of Bate- 

 son's "Mendel's Principles of Heredity," under the caption "Con- 

 cluding Remarks," in Mendel's first paper.) 



At p. 136 of Hoffmann, No. 118, under the heading of the 

 genus Pisum^ appears the following : 



"Pisum in 6 years' observations by G. Mendel (Verh. Nat. Histor. Ver. 

 zu Briinn, 1865, IV, pp. 6 and 33). Hybrids of Pisum sativum, etc., from 

 forms true to seed." 



After a considerable discussion of the possibilities in respect to 

 accidental crossing by insects (referring still to Mendel), Hoff- 

 mann concludes as follows: 



"Hybrids possess an inclination in the following generation to strike 

 back to the parental species." 



It seems extraordinary that, as Punnett remarks, although Hoff- 

 mann's somewhat extended experiments were carried on with 

 Phaseolus, he should have made no mention of Mendel's experi- 

 ments with this genus, which should have been easily noticed, 

 since they were reported upon toward the close of the paper on 

 peas. No mention is made of Mendel's paper on Hieracium crosses, 

 although a brief paragraph (No. 75, p. 144) is devoted by Hoff- 

 mann to Hieracium variation studies. 



BIBLIOGRAPHY 



Focke, Wilhelm Olbers. 



Die Pflanzenmischlinge, ein Beitrag zur Biologic der Ge- 



wachse. Berlin, 1881. 



Gartner, Carl Friedrich von. 



(a) Versuche und Beobachtungen iiber die Befruchtungsor- 

 gane der vollkommeneren Gewachse, und iiber die na- 



