CHAPTER V.

=DIFFICULTIES AND SOURCES OF ERROR IN THE DETERMINATION OF FOSSIL PLANTS.= Pp. 93–109.

External resemblance. Venation characters. Decorticated stems. Imperfect casts. Mineral deposits simulating plants. Traces of wood-borers in petrified tissue. Photography and illustration.

=NOMENCLATURE.= Pp. 110–115.

Rules for nomenclature. The rule of priority. Terminology and convenience.

PART II. SYSTEMATIC.