642 FARM ' SEEDS ' I SPECIAL 



the paler seeds of turnip — namely a brownish-red or dirty-claret 

 tint. The seed has no smell, but when rubbed in a mortar with 

 water, a pungent odour of mustard-oil is given off. Brightness 

 similar to swede and turnip. 



Purity. — Usually good, but occasionally it is found mixed 

 with swede, turnip and charlock seed. 



Germination Capacity. — Should be 85 per cent. 



Weight. — 1000 seeds weigh about 1-5 to 2 gr. 



White Mustaxd {Brassica alba Boiss.). 



Form and Size. — The seeds of white mustard are rounder 

 and considerably larger than those of black mustard, having an 

 average diameter of about 2 -3 mm. 



Colour, Taste and Smell. — The colour is a pale yellow or 

 yellowish white with a greenish tinge occasionally. Like black 

 mustard the seeds have a biting taste, but when rubbed with 

 water they do not give off any pungent odour. The surfaces 

 are not so rough as those of black mustard, the markings being 

 very much finer. 



Purity. — Should be at least 98 per cent. 



Germination Capacity. — In good samples this is usually 

 over 95 per cent. 



Weight. — 1000 seeds weigh nearly 6 gr. Bushel-weight, 

 50-56 lbs. 



Charlock (Brassica Sinapis Vis.).— The seeds are similar 

 in size to those of turnip, only a little darker and browner. 

 Their surfaces are, however, smoother in texture, but none of 

 these characters are sufficient to distinguish them when mixed 

 with turnip or swede seeds. Charlock seeds, however, have 

 a pungent biting taste resembling that of black and white 

 mustard. 



LINAGE.^. — -Flax or Linseed (Linum usitatissimum L). 



Form and Size. — The seed is oval, from 4 to 6 mm. long and 

 2 to 3 mm. broad, flattened on the side and pointed at one end. 



