198 HORTUS GRAMINEUS WOBURNENSIS. 



Native of Britain. Root perennial. 



Experiments. At the time of flowering, the produce from a 



clayey loam is 



Produce per Acre. 



dr. qr. Ibs. 



Grass, 22 oz. The produce per acre 14973 12 



80 dr. of grass weigh, when dry 40 7 



The produce of the space, ditto - 176 03 



The weight lost by the produce of one acre in drying 7486 14 



64 dr. of grass afford of nutritive matter 2 dr. 6 gr. "J 



The produce of the space, ditto 363 5 



At the time the seed is ripe, the produce is 

 Grass, 40 oz. The produce per acre 27225 



dr. qr. 



80 dr. of grass weigh, when dry - 34 ? 



The produce of the space, ditto - 272 5 



The weight lost by the produce of one acre in drying 15654 6 



64 dr. of grass afford of nutritive matter 2 3 i 



The produce of the space, ditto 27 2 J 



The produce of latter-math is 



Grass, 14 oz. The produce per acre - 9528 12 



64 dr. of grass afford of nutritive matter 1 2 223 5 4 



A comparison will shew how inferior this smaller variety of 

 meadow cat's-tail grass is to the larger variety. 



The larger meadow cat's-tail grass, as before, affords of nutri- 

 tive matter from the produce of one acre : 



Ibs. Ibs. 



At the time of flowering - 1595 i 



At the time the seed is ripe 3668 5 



The smaller variety of meadow cat's-tail grass affords, 

 from the produce of one acre at the time of flower- 

 ing and ripening the seed, as above - - 1684 

 The weight of nutritive matter, in which the produce 

 of the larger variety of meadow cat's-tail grass ex- 

 ceeds that of the smaller is - 3579 



Or, the former grass is superior to this one, in the proportion 

 nearly of 25 to 8. This shews how important a point it is to dis- 

 tinguish one variety of grass from another, when they are so very 

 much alike in outward characters, as in the above instance. The 

 seeds are also very similar to each other, or rather the marks which 

 distinguish them from each other are minute. A careful examin- 



