[1] Aorist infinitive(s), from the quotation which follows. For the equivalence cf. zeta 60.
[2] The quotation is not from Herodotus but from the emperor Julian, Epistles 155, talking about historians and geographers who describe ethnic groups with a diet different from ours. Herodotus 3.19-25 and 4.186 describes Fish-eaters and Meat eaters (web address 1 below), which are mentioned in the part of the letter preceding this (see the full version at eta 536).
[3] Hemlock, aconite and hellebore are poisonous plants.