[3] This experiment is sometimes difficult to manage successfully, though it appears so simple. Great care should be taken not to overdose the plant with iron.
[4] Ordinary methylated spirit is rather impure alcohol, which will do if you cannot get any better.
[5] It is better to have half a dozen examples for each experiment, for the seedlings do not always act quite quickly and correctly, and from half a dozen you can see the average result.
[6] Spores are simple little structures which do much of the work of seeds. See the Chapter on Ferns.
Transcriber's Note
The following apparent errors have been corrected:
- p. 17 "(see Chap. VI.)," changed to "(see Chap. VI.)."
- p. 40 "actually the case" changed to "actually the case."
- p. 61 "adventititious" changed to "adventitious"
- p. 84 "B. Primrose" changed to "B, Primrose"
- p. 101 "places we do not not need" changed to "places we do not need"
- p. 107 "ordinary leaflets" changed to "ordinary leaflets."
- p. 142 "stem and leaves" changed to "stem and leaves."
- p. 165 "them Did you ever" changed to "them. Did you ever"
- p. 197 "Anther, 80, 81" changed to "Anther, 80, 81"
- p. 198 "179, 152 181" changed to "179, 152, 181"
- p. 199 "without CO2 20" changed to "without CO2, 20"
- p. 200 "twining of petioles, 107" changed to "twining of petioles, 106"
- p. 201 "Seeds, maize, 10" changed to "Seeds, maize, 9"
Archaic or inconsistent language has otherwise been kept as printed.