APPENDIX 353 



opinion cannot be unconditionally accepted, we find on the other 

 hand in Gartner's experiments a noteworthy confirmation of that 

 supposition regarding variability of cultivated plants which has 

 already been expressed. 



Among the experimental species there were cultivated plants, 

 such as Aquilegia atropurpurea and canadensis, Dianthus caryophyl- 

 lus, chinensis, and j a ponicus, Nicotiana rustica and paniculata, and 

 hybrids between these species lost none of their stability after four 

 or five generations. 



