Mr. Gaddum will try to dispel the illusion that all snakes are dangerous and should be killed at sight. He will describe the harmless grass snake and tell listeners how they can distinguish it from the adder, which is the only dangerous snake in the British Isles. Finally he will talk about the adder, and will endeavour to prove that it is not so bad as it is often painted. Teachers will find it helpful to have illustrations of a grass snake, and an adder or viper, to show their classes.