670 



I- A KM SJ-JUjS 



Sl'J'lCIAI. 



Purity. — Samples of this seed should he jjerfectly pure. They 

 are, however, often adulterated with the smaller fescues 

 (see page O71;, and Purple Melick grass (Molinia 

 ca:rulea Moencli.;. Seeds of the latter are larger, 

 more swollen near the base ; their flowering glumes 

 are smooth, three-nerved, not awned and purjjlish in 

 colour especially at the tip (Tig. 21C;. The rachilla 

 is longer than in crested dogstail. 



The caryopses of Yorkshire fog enclosed in the 



smooth silvery-wliite flowering glume and pale is a 



frequent and very objectionable impurity. 



Fi' 216— ^^® Germination Capacity in the very finest 



Seedf-f samples is about 95 per cent., with a bushel-weight of 



MciK.k -in lbs; samples containing 6; to 70 per cent, of 



living seeds may be considered good. 1000 seeds 



should weigh -48 gram. 



Cock's foot ( /jactylis glomerala L.). 

 Form, Sizi., and Colour. — 'J'he flowering glurne 

 of this seed has a well-marked keel with strong hairs 

 upon it, and a stiff rough awn which is slightly curved 

 arises just below its tip. (Fig. 217). The whole seed 

 is pale yellowish white, somewhat flattened on one 

 side and about 5 mm. long without the awn. 



PuriTV. — The best seedsmen supply it of 

 100 per cent, purity, but samples are often 

 adulterated with the low priced Perennial Rye- 

 Crass, Fescues and Purple Melick Grass {Molinia 

 carulea Moench.). Yorkshire Fog (HoUus lanatus 

 L.;, Soft Brome-Grass (Bromus mollis L.) and Dock 

 seeds are deleterious impurities to be specially 

 looked for. 



\\ 



E. 217.— 



Seed of 

 Cock's-fooL 



Pieces of spikelets consisting of two or three 

 seeds are found in samples which have Ijeen 

 harvested unripe. 



