Petrified Stems and Leaves.

Fig. 1. A portion of the trunk of the fossil vegetable called Stigmaria ficoides (of M. Alex. Brongniart); it is the root of a tree common in the coal deposits; see Supplementary Notes, Art. Stigmaria, p. 198, for a description of the nature and mode of occurrence of these fossils.

Fig. 2. Impressions of dicotyledonous leaves in travertine; a modern calcareous deposit; from Campania.[8]

[8] Medals of Creation, vol. i. p. 193.

Fig. 3. Part of the stem of a reed-like plant (Calamites dubius, Brongniart); from the coal deposits of Yorkshire. See description of Calamites.

Fig. 4. Appears to be a fragment of the stem of a species of Lepidodendron.

Fig. 5. Fragment of the leaf of a Cycadeous plant, from the oolite of Stonesfield. (Zamia pectinata.)

Fig. 6. Portion of an ironstone nodule, split asunder, showing part of the terminal branch of a Lepidodendron, from Coalbrook Dale. See description of Lepidodendron.

Fig. 7. "A pebble that appears to have been partly enveloped in a leaf while in a soft state, which has produced the markings on its surface."—Mr. Parkinson.

Fig. 8. "Ligniform pitchstone;" fossil wood having a resinous transparency; supposed by Mr. Parkinson to have originated from an intermixture of silex and bitumen; the internal part is opalized.