140 HORTUS GHAMINEUS WOBURNENSIS. 



Experiments. — The produce of herbage from a space of four 



square feet of a clayey loam, on the 12th of April, is — 



Produce per Acre. 

 dr. qr. lbs. 



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



64 dr. of grass afford of nutritive matter 3 1 > 

 The produce of the space, ditto - 11 1| 5 



At the time of flowering, the produce is, 

 Grass, 30 oz. The yjroduce per acre - - 20418 12 



80 dr. of grass weigh, when dry - 24 7 Q\2S 10 



The produce of the space, ditto - 144 5 

 The weight lost by the produce of one acre in drying 14293 2 

 64 dr. of grass afford of nutritive matter 12^ .«g q q 

 The produce of the space, ditto - 11 1 3 



The produce from a siliceous sandy soil is. 

 Grass, 12 oz. 8 dr. The produce per acre - 8507 13 



80 dr. of grass weigh, when dry - 24 > 2552 5 8 

 The produce of the space, ditto - 60 5 



The weight lost by the produce of one acre in drying 5955 7 8 

 64 dr. of grass afford of nutritive matter 10^ joo 14 15 

 The produce of the space, ditto - 3 0^ 3 



At the time the seed is ripe, the produce from a clayey loam is, 

 Grass, 19 oz. The produce per acre - - 12931 14 



80 dr. of grass weigh, when dry - 36 > ^gjg ^ g 

 The produce of the space, ditto - 136 3J- 3 



The weight lost by the produce of an acre in drying 7112 8 8 

 64 dr. of grass afford of nutritive matter 2 17 ^^^ jq ^ 

 The produce of the space ditto - 10 2|5 



The weight of nutritive matter which is lost by leaving the crop 

 till the seed be ripe, is 23 lbs. 14 oz. 14 dr. The proportional 

 value which the grass, at the time the seed is ripe, bears to that 

 at the time of flowering, is as 3 to 2. From a sandy loam 64 dr. 

 afforded 3 dr. of nutritive matter, which gives the superiority to 

 the produce from a light loam over that from a clayey soil, as 

 4 to 3. 



an obvious specific distinction was thereby aflforded, but the succeeding culms had 

 the spikes furnished with long awns ; — offering another proof of the uncertainty of 

 specific characters, founded on the existence or non-existence of the dorsal awn in 

 grasses. — See Smith's English Flora, vol. i. p. 90. 



