By M. De Candolle. 



there does not appear any important difference. Another 

 variety is known by the name of Raifort gris, (Gray Radish) ; 

 this is sometimes extremely pale, or nearly white. The Ra- 

 phamis alius orbicularis of Miller, gros Raifort blanc, or 

 Radis (T Aitgsbourg, called in England, White Spanish Radish, 

 is a variety less known. 



Observations on the Cross-bred Vegetables, found among the 

 preceding Plants. 

 There is no doubt that many of the plants which I have 

 enumerated are the results of different cross-breeds, obtained 

 by mere chance, in various gardens, and preserved by the care 

 of agriculturists. Having never found an opportunity of 

 making such experiments methodically, I shall content my* 

 self with relating a few facts communicated to me by M. 

 Sageret, who being an excellent and zealous cultivator, has 

 devoted several years to the trial of cross-breeds. The results 

 he has obtained on cultivated Cabbages appear to me worthy 

 the attention of the curious. The cultivated Cabbage, Bras- 

 sica oleracea, according to M. Sageret, presents a singular 

 phenomenon, that of being incapable of receiving fecundation 

 from any but its own species ; he tried in vain the pollen of 

 the Brassica campestris oleifera, or Colsa, as well as that of 

 every other species of Brassica ; he then found out that it had 

 a natural tendency to fecundate several other species of Cab- 

 bages, and even the cultivated Black Radish, but it could not 

 be impregnated by any except its own varieties : the Brassica 

 oleracea botrytis has not, however, undergone a trial with it. 

 It appears that the cross-breeds known are produced in gar- 

 dens without any interference. 



