By M. De Candolle. 



41 



possible to use terms of comparison for the different experi- 

 ments made by cultivators and more especially for those of 

 Mons. Gaujac* The medium product of a hectarf ■ of ground 

 cultivated in oleiferous cruciferous plants appears to be, 



Brassica campestris oleifera. J Kiliogramme 955 of oil 

 Brassica Napus oleifera - - - 700 

 Brassica oleracea acephala fimbriata - 700 

 Brassica campestris Napo-brassica communis 650 

 Brassica campestris Napo-brassica Ruta-baga 650 

 Camelina sativa - 595 



Brassica preecox ----- 450 

 Hesperis matronalis - - 350 

 Brassica Rapa oleifera - (undetermined.) 

 Raphanus sativus Radicula oleifera - ditto 

 Brassica elongata - ditto. 

 If we now compare the cruciferous plants together, in a 

 different point of view, we shall obtain some curious results on 

 their organization. Most of them, and perhaps the whole 

 number, are susceptible of two different variations, the one 

 having a thin, slender, slightly fleshy root, the other a thick and 

 fleshy root : in general, those of the first kind bear a consider- 

 able quantity of seeds, and are cultivated throughout Europe 

 as oleiferous vegetables ; the others, on the contrary, bring 

 few seeds to perfection, nnd are cultivated in general for their 

 roots, as excellent for field or garden vegetables. So in the 

 Brassica oleracea, the varieties that have a thin stalk are culti- 

 vated for their seeds, and those that have swelled radicles are 



* Bull. Soc. Encourag. industr. Paris, p. 67 et 69. 

 f The Hectar is equal to 2 acres, 1 rood, 35.4 perches English. 

 % The Kiliogramme is equal to 2lb. 8oz. 12.146 grains troy. 

 VOL. V. G 



