REPORT ON VARIOUS MANTJRES AT CHISWICK. 
69 
the produce by mineral manure alone, is partly due to adherent 
soil, of which, in all cases, there is some on the lower leaves, the 
whole of which cannot be removed, and which would the more 
increase the percentage of incombustible matter the smaller 
the amount of produce ; and in this case it was very small. 
Diagram 9. LoUum perenne. — Under all six conditions of 
manuring, this grass grew more luxuriantly, and eventually 
produced a larger amount of vegetable matter, than any other. 
Even without manure, its produce was considerably more than that 
of either Antlioxanthmn odoratum, Poa annua, or Poa trivialis, and 
nearly as much as that of Dactylis glomerata, and JBromus mollis 
with it. With mineral manure it gave considerable increase, 
probably due to more active root-development, and hence gather- 
ing up available nitrogen from a more extended range of soil. 
The nitrogenous manures gave still more increase, probably 
limited, however, by season and want of room, as the plants 
with these manures especially were as crowded and luxuriant as 
the space would admit of. That the most luxuriant plants were, 
at the time of cutting, not the most matured, and might, there- 
fore, with extension of season have given more growth, is pro- 
bable from the fact that, as a rule, the higher the amount of pro- 
duce, the higher also is the percentage of mineral matter in the 
dry substance. 
Diagram 10. Poa annua. — As in these boxes there was not 
only an uneven plant, but a mixture of Poa trivialis and Poa 
annua, little need be said about the final result of growth. With 
uneven plant there is no consistent increase of vegetable matter 
with the more liberal nitrogenous and mineral manuring ; but 
the high, both actual and relative, percentage of mineral matter 
in the dry substance, when the nitrogenous manures were used, 
indicates a tendency rather to luxuriance than maturation in the 
majority of such plants as grew. 
Diagram 11. Poa trivialis. — The plants in these boxes were 
also uneven, and they contained, besides, much Poa annua. The 
amount of growth was, under all conditions of manuring, less 
than in the case of an}^ other grass, excepting in some instances 
the AnthoxantJium. 
Diagram 12. Bromus ojiollis. — As in the cases of the Dactylis 
and Lolium especially, so also in that of the Bromus, the charac- 
teristic effects of the different manures were masked or prevented 
by crowding and over-luxuriance. Accordingly the nitrogenous 
