Note 1126 — Chapter VII · (continued 2)

Hence the removal of a great source of error; since it is now understood that in dicotyledons alone can age be known with certainty. Henslow's Botany, p. 243: compare Richard, Eléments de Botanique, p. 159, aphorisme xxiv. On the stems of endogenous plants, which, being mostly tropical, have been less studied than the exogenous, see Lindley's Botany, vol. i. pp. 221–236; where there is also an account, pp. 229 seq., of the views which Schleiden advanced on this subject in 1839.