12 to 13; and the value of the latter-math stands in pro- 
portion to that of the crop at the time of flowering, as 5 to 
1 2, and to that of the crop taken at the time the seed is 
ripe, as 5 to 13. 
This species of fescue greatly resembles the rye grass, in 
habit and place of growth ; it has excellencies which make 
it greatly superior to that grass, for the purposes of either 
hay or permanent pasture. This species seems to improve 
in produce in proportion to its age, which is directly the 
reverse of the Lolium perenne, 
XXXIV. Poa crist ata. Host. G. A. 2. t. 75. — • Aira Cris- 
tata. Engl. Bot. 648. 
Crested meadow-grass. Nat. of Britain. 
At the time of flowering, the produce from a sandy 
loam is 
oz. 
Grass, 16 oz. The produce per acre - 174240 
80 dr. of grass weigh when dry - 36 dr. \ 7S4H 
The produce of the space, ditto - 115^ J 
The weight lost by the produce of one acre in drying - 
64 dr. of grass afford of nutritive matter 2 dr. { 5445 
The produce of the space, ditto 8 / 
or lbs. per acre. 
0 == 10890 0 0 
0 = 4900 8 O 
- - 5989 8 O 
0 =. 340 5 0 
The produce of this species, and the nutritive matter that 
it affords, are equal to those of the Festuca ovma at the time 
the seed is ripe: they equally delight in dry soils. The 
greater bulk of grass in proportion to the weight, with 
the comparative coarseness of the foliage, render the Poa 
cristata inferior to the Festuca ovma . 
XXXV. Festuca myurus . Engl. Bot. 1412. Host. G. A. 2. 
t. 93. 
Wall fescue-grass. Nat. of Britain. 
At the time of flowering, the produce from a light sandy 
soil is 
Grass, 14 oz. The produce per acre - 152460 0 = 9528 12 0 
80 dr. of grass weigh when dry - 24 dr. 1 
The produce of the space, ditto - 67^ j 0 
The weight lost by the produce of one acre in drying - 6670 2 0 
64 dr. of grass afford of nutritive matter 1.2 dr. 
The produce of the space, ditto -5.1 / 
3573 4 = 223 5 4 
This species is strictly annual ; it is likewise subject to 
the rust ; and the above being its whole produce for one 
year, it ranks as a very inferior grass. 
