How did Douglas make sure that he conquered the old terror?

How did Douglas overcome his fear of water?

How did Mendel make sure that the plants were true breeding?

How did Mendel make sure that the pea plants were true breeding?

How does Douglas make clear to the reader the sense of panic that gripped him as he almost drowned? Describe the details that have made the description vivid.

The Assam State derives its name from that of a tribe that conquered the region. Where did the tribesmen come from?