140 HORTUS GRAMINEUS 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. Ibs. 



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



64 dr. of grass afford of nutritive matter 31") 

 The produce of the space, ditto 11 1 j 3 



At the time of flowering, the produce is 



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



80 dr. of grass weigh, when dry - 24 7 

 The produce of the space, ditto - 144 5 612510 

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

 64 dr. of grass afford of nutritive matter 12} 

 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 } 



The produce of the space, ditto 60 I 2552 5 8 



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

 64 dr. of grass afford of nutritive matter 10} 

 The produce of the space, ditto 3 0| 3 132 14 15 



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 ~> _,Q 



The produce of the space, ditto 136 3* 3 



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

 64 dr. of grass afford of nutritive matter 21) *rA i^ <r> 

 The produce of the space ditto - - 10 2 J 3 



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

 till the seed be ripe, is 23 Ibs. 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 afforded ; 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. 



