248 Report of Experiments with different Manures 
so obtained that are recorded in the Tables. It should be men- 
tioned, that we are indebted to Dr. Evan Pugh, of Pennsylvania, 
for tlie superintendence of the Botanical part of the inquiry. 
It will be obvious, that absolute exactness in the determination 
of the proportions in which the different plants really occurred 
on the respective plots, would be extremely difficult to attain. If 
the bulk of the sample taken were so large as to exclude all pos- 
sible doubt of its being a fair average of the whole produce, the 
labour of the separations would be so great as to be almost im- 
practicable. There is, however, no doubt that the Tables do, in 
the main, very closely represent the facts. They do so, at any 
rate, quite sufficiently to bring very strikingly to view the most 
characteristic and important distinctions that were observed to be 
developed. 
In the respective columns of the Table of detail (IX.^ are 
given : — 
1st. The Botanical names of the plants. 
2nd. I^he Common or English names. 
3rd. The percentage proportions of each plant, (fcc, on some 
of the most important of the experimental plots. 
4th. Notes taken on a comparative examination of the 
specimens. 
The plots selected for the Botanical analysis of their produce 
were : — 
Plot 1. Unmanured. 
Plot 4. With ammoniacal salts alone. 
Plot 8. With the " mixed mineral manure " * alone. 
Plot 10. With the " mixed mineral manure," and ammoni- 
acal salts. 
Plot 13. With the " mixed mineral manure" and the double- 
quantity of ammoniacal salts. 
Plot 16. With farmyard manure. 
Plot 17. AVitli farmyard manure and ammoniacal salts. 
The separated plants are classified into : — 
1st. Graminaceous herbage (Grasses commonly so called)^ 
in culm, bearing flower or seed. 
2nd. Graminaceous herbage, detached leaf and undeveloped 
stem. 
3rd. Leguminous herbage. 
4tli. Miscellaneous herbage, chiefly weeds. 
AVithin each of these classes, the plants are enumerated in the 
Table, in. the order in toJiich tlicy respectivclj/ occurred iiitlte largcse 
* For full description of the " Mixed Mineral Manure," see Part I. of this 
Paper, vol. xix., p. 550 of this Journal. 
