This afternoon Mr. Gaddum is to tell listeners how to make an aquarium, and the cheapest possible way to set about it. He will tell them how to keep the water fresh. There are animals that will live peacefully together and there are those that will kill each other if placed in the same aquarium. Mr. Gaddum will talk about both, and about the fish called the stickle-back and the curious nest it makes. Finally, he will give a short account of other curious pond animals, which can easily be made to live in captivity.
Teachers will find it helpful to have illustrations or specimens of pond-weed, water snails, stickle-backs and a horse-leech to show their class.