“…In the case of bark and wood of an angiosperm (Acacia penninervis Sieb, ex DC., Smelstorius and Stewart 1974), determinations of total contents of lignin and extraneous substances as well as Klason and acid-soluble lignins have been carried out and are summarised in Table ι below. In the case of bark and wood of an angiosperm (Acacia penninervis Sieb, ex DC., Smelstorius and Stewart 1974), determinations of total contents of lignin and extraneous substances as well as Klason and acid-soluble lignins have been carried out and are summarised in Table ι below.…”