on Permanent Meadow Land. 
26a 
perennial Red Clover or Cow-grass. They are too well known to 
every farmer to require description here. 
Perennial Red Clover amounted to little more than 1 per cent, 
of tlie total produce on the unmanured land, but to nearly 18 per 
cent, of that grown by mineral manures alone. Not any of it 
was found in the produce by either ammoniacal salts alone, or 
ammoniacal salts in conjunction with mineral manures. There 
was little more than 1^ per cent, of it in the produce by farm- 
yard manure alone, and less than ^ per cent, in that by farm- 
yard manure and ammoniacal salts. 
The proportion of total Leguminous Herbage found in the pro- 
duce of the unmanured plot, was about 5 per cent. This was 
made up of two parts Meadow Vetchling, rather less than two parts 
Bird's-foot Trefoil, and rather more than one part Perennial Red 
Clover. The produce by mineral manures alone was estimated to 
contain about 23 per cent, of Leguminous herbage, or about 4^ 
times as high a proportion as that grown without manure. These 
23 parts comprised about 4i parts Meadow Vetchling, about ^ a 
part of Bird's-foot Trefoil, and about 18 parts of Perennial Red 
Clover =15 times as much as was found of it in the unmanured 
produce. The ammoniacal salts alone, reduced the proportion of 
total Leguminous plant to little more than 2 per cent, in the pro- 
duce, and then it consisted entirely of Meadow Vetchling : the 
Bird's-foot Trefoil and the Perennial Red Clover being apparently 
extirpated. And, in the produce by mineral manures and am- 
moniacal salts together, not any Leguminous plant was to be 
found. The farm-yard manure produce contained less than 4 per 
cent, of Leguminous plant, which consisted of nearly equal parts 
Meadow Vetchling and Perennial Red Clover, to the exclusion of 
the Bird's-foot Trefoil. The addition of ammoniacal salts to farm- 
yard manure, reduced the proportion of Leguminous herbage to 
about one-half. There was still no Bird's-foot Trefoil ; and the 
Perennial Red Clover, as before, gave way more than the Meadow 
Vetchling under the influence of the ammoniacal salts. 
III. Miscellaneous Herbage, chiefly Weeds. 
The fourth Division of the Table shows, that there were nine 
descriptions of these questionably useful, or even objectionable 
plants, detected in the samples from the experimental plots. 
Only seven of them were found together on the unmanured land, 
and a smaller number still on each of the manured plots. A few 
remarks will be made upon the characters, and conditions of 
occurrence, of these several plants, taking them in the order 
in which they occurred in the largest proportion on the un- 
manured land. 
