FOOTNOTES:
[B] Bromine, iodine, etc., are sometimes detected in particular plants, but need not occupy the attention of the farmer.
[C] This classification is not strictly scientific, but it is one which the learner will find it well to adopt. These bodies are called neutrals because they have no decided alkaline or acid character.
[D] In some soils the fluorides undoubtedly supply plants with soluble silicates, as fluoric acid has the power of dissolving silica. Thus, in Derbyshire (England), where the soil is supplied with fluoric acid, grain is said never to lodge.
[E] Sourness.
[F] There is reason to suppose that alumina is an essential constituent of many plants.
CHAPTER V.
GROWTH.
Of what does a perfect young plant consist?