BLACK OR BROWN MUSTARD 641 



of the swede is different from that of the cabbage, being a deep 

 purple, almost black. Only in old seed is a grey tinge observ- 

 able. Good swede seed, moreover, has a bright appearance. 

 Samples with many seeds of a pale purplish red tint are un- 

 ripe. No smell is noticeable, and the taste is oily with a slight 

 bitterness. 



Purity. — Similar to cabbage. 



Germination Capacity. — This should be from 90 to 95 per 

 cent, in good samples. 



Weight. — 1000 seeds should weigh from 3 to 3*5 grams. 

 Bushel-weight, 50-56 lbs. 



Turnip (Brassica Rapa L.). — There are a considerable 

 number of varieties of turnips ; as in the case of the swede, an 

 oil-yielding non-bulbing variety is known. 



Form and Size. — No constant difference is met with among 

 the seeds of the separate varieties, all of which very closely 

 resemble the swede. They are usually, however, slightly smaller 

 than the latter. 



Colour, Brightness and Smell. — The brightness is the same 

 as the swede, but the colour of a sample when seen in bulk is paler, 

 more purplish-red seeds being present than in the former kind 

 of seed. The surface markings are similar to the swede but 

 slightly coarser. Smell and taste like the swede. 



The Purity and Germination Capacity may be taken to 

 be the same as the swede. 1000 good seeds weigh about 2-5 

 grams, the weight of a bushel is usually 50 lbs. 



Black or Brown Mustard (Brassica nigra Koch.). 



Form and Size. — The seeds are round or oval, and smaller 

 than those of turnip or swede, the diameter varying from i to 

 1-5 mm. The surface of the seeds is marked with irregular 

 hexagonal pits, much more distinct and larger than those on 

 the turnip and swede ; they appear as fine dots when examined 

 with a pocket lens. 



Colour, Brightness and Smell. — The colour is like that of 



2 s 



