HORTUS GRAMINEUS WOBURNENSIS. 183 



Produce per Acre, 

 dr. qr. lbs. 



Grass, 13 oz. 8 dr. The produce per acre - 9188 7 



80 dr. of grass weigh, when dry - 34 ^ oonr 



The produce of the space, ditto - 91 3|^ ^ 



The weight lost by the produce of one acre in drying 5283 5 10 



64 dr. of grass afford of nutritive matter 4 0^ 



The produce of the space, ditto - 13 2 5 



At the time the seed is ripe, the produce is — 



Grass, 7 oz. The produce per acre - 4764 6 



80 dr. of grass weio;h, when dry - 32 > , 



• r 1905 12 



The produce of the space, ditto - 44 3317 3 



The weight lost by the produce of one acre in drying 2858 10 



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



The produce of the space, ditto - 5 2| 3 



The weight of nutritive matter which is lost by leaving 



the crop till the seed be ripe, exceeding one-half of 



its value, is _ _ _ _ 332 5 7 



This grass springs early, but the produce is inconsiderable, 

 compared to that of many others equally nutrient. It is seldom, 

 or, according to my experience, never found in a natural state, 

 except in woods and under the shade of trees. Nevertheless, the 

 seeds vegetate readily when sown on exposed situations ; and the 

 plants grow freely, and attain to a greater size and strength, than 

 those in the woods and in the shade. It is singular, that before 

 the period of coming into flower, the plants that are thus culti- 

 vated are invariably attacked by the disease termed rust, which 

 pervades every part of the plant. In moist and cloudy seasons 

 the disease is much less severe, being chiefly confined to the 

 leaves. I never could observe the least trace of this affection in 

 the plants of this species while in their natural place of growth. 

 The tall oat-like soft-grass (Holcus avenaceus), which affects 

 the shade, and is subject to the above disease, is always free from 

 this affection when growing in the shade. It is likewise precisely 

 the case with the Agrostis stoloinj'era, var. sylvatka, or wood 

 stoloniferous bent-grass. There are grasses which are also pecu- 

 liarly confined to woods or shady situations, but which continue 

 free from this disease when transplanted to exposed situations, as 

 the wood millet-grass {Milium effusuin), hairy wood brome- 

 grass, (Bromus hirsutus), and tall brome-grass (Bromus giganteus). 

 There exists no difference in the structure of those grasses subject 



