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In addition to the works referred to in the last chapter, the student should consult Pfeffer's Physiology, pp. 86-149, and pp. 410-441. With reference to water cultures, Sachs' Lectures, XVII., may also be consulted. The standard work on ash constituents of plants is Wolff, Aschen-analysen, 1871 and 1880, an indispensable book of reference in this connection, though there are others, quoted in Pfeffer, where further literature may also be found.