Fossil plants, Vol. 1: [A text-book] for students of botany and geology

by A. C. Seward

[115] Witham (81), Christison (76).

[116] Cole (94), figs. 1 and 3.

[117] Harker (95) p. 233, fig. 56.

[118] I am indebted to Dr Renault of Paris for showing to me several preparations illustrating this method of petrifaction.

[119] Cash and Hick (78).

[120] Stur (85).

[121] Thiselton-Dyer (72) Pl. VI.

[122] Carruthers (70).

[123] Schultze (55).

[124] I am indebted to Prof. Lebour of the Durham College of Science for the loan of this letter.