No. 628] VON GABTNEB AND PLANT IITBBIDIZATION 443 



Parents. Hylrid Seeds. 



Paris Wax (yellow) X Sugar Peas (greenish yellow) yellow. 



Paris Wax (yellow) X Early Green Brockel (green) . greenish-yellow. 



Sugar Pea (greenish yellow) X I^^arf Creeping (yellow) .. dirty-yellow.^ 

 Sugar Pea (greenish yellow) X Early Green Brockel (green) .no change. 

 Dwarf Creeping (yellow) X Early Green Brockel (green) .. greenish-yellow. 



Early Green Brockel (green) X Paris Wax (yellow) dirty-yellow. 



Early Green Brockel (green) X Sugar Pea (greenish yellow) .yellow. 

 Early Green Brockel (green) X Dwarf Creeping (yellow). . .yellow. 



As the above results show, the same dominance of yel- 

 low over green in the hybrid seed appears as in the ex- 

 perience of Knight, Goss and Seton. 



Respecting identical results obtained as the result of 

 reciprocal crosses, Gartner makes the following unquali- 

 fied statement: 



The most important and the most interesting phenomenon in the 

 crossing of plants in hybrid breeding, is the complete similarity of the 

 two products; since the seeds produced from the one as from the other 

 fertilization, give rise to plants of the most complete similarity, so that 

 their different origin and derivation, upon the most careful investiga- 

 tion of both kinds of hybrids, does not show the least difference in 

 respect to their form and type; and even the most practiced specialist 



hybrid with respect to the sex of the parents (p. 223). 



Gartner's work is not only noteworthy for its remark- 

 able extent with respect to the number of species experi- 

 mented upon, but with regard to the care which he exer- 

 cised in his operations, he says : 



of hybrid breeding, and for testing the conclusions derived therefrom, 

 we have repeated most of the experiments, especially the doubtful cases, 

 not once onlv. but several times, and put tliem to the test throudi cross- 



