266 Report of Experiments with different Manures 
8. — Veronica chamcedrys — Germander Speedwell — 
was found only in the produce by mineral manures alone, and by 
farm-yard manure alone ; and in both cases in very small amount. 
9. — Galium verum — Common Yelhw-Jlowered Bed-straw, 
or Cheese-rennet. 
This plant was only found in the sample g;rown by the mixed 
mineral manure in conjunction with the lesser quantity of ammo- 
niacal salts. 
It is possible that there were some other plants that either did 
not come within the reach of the scythe, or were otlierwise 
excluded from our samples or determinations. Nor are the exact 
numerical proportions set down in the Table, to be considered, 
either within this or the other classes of plants, as anything 
more than approximations. Such, however, they undoubtedly 
are ; and the facts brought out regarding the distribution, 
and development, of Miscellaneous Weedy herbage, according 
to manure, are very clear and striking. 
From this examination the very satisfactory result appears, 
that by far the larger nuniber of the obnoxious or comparatively- 
useless plants occurred in the produce of the unmanured land. 
Taken collectively, too, their proportion was there very much 
larger than under any of the other conditions, excepting the one 
where the farm-yard manure and ammoniacal salts were used 
together. It was chiefly the Rib-grass, and the Sheep's-sorrel or 
Dock, that were encouraged by this latter nanurin?. The farm- 
yard manure alone gave a larger proportion of Weedy herbage 
than any of the artificial manures ; but not half as much as either 
the unmanured land, or that manured hy farm-yard manure and 
ammoniacal salts. On all the artificially-manured plots the 
number of species found was reduced to about half that occurring 
on the unmanured land. In fact, those artificial manures which 
were the most productive, not only reduced the number of species 
of weeds considerably, but reduced the proportion of the total of 
such produce to about one-tenth as much as was developed loith- 
out manure. It is certainly very satisfactory to find, that the most 
active artificial manures had the effect of very greatly reducing 
the proportion of the useless and obnoxious plants in the mixed 
herbage of the meadow. It is, on the other hand, somewhat dis- 
couraging to find, that the influence oi farm-yard manure, which 
must be relied upon for the hay-c rop to a certain extent, was not so 
favourable. It is to be hoped, that the facts which have been 
adduced regarding the conditions of development, and the 
amounts, of tlie Miscellaneous Weedy herbage on the meadow 
