Explanatory notes
… They achieve their results by nerve‑poisoning, by stomach‑poisoning, by asphyxiation or by odour, etc. The … insecticides, etc., or in such forms (e.g., in balls, strings of balls, tablets or plates) that there can be no … here (e.g., solutions of pyrethrum extract (other than standardised pyrethrum extract), or copper naphthenate in a …