"I don't remember that we ever found any like these," he said. `Would you be interested in them?'

Would I? Instantly I knew this book was not finished. As I held the firm, heavy, leaf-rolled cocoons in my hand, I could see the last chapter sliding over from fourteen to fifteen to make place for Promethea, the loveliest of the Attacine group, a cousin of Cecropia. Often I had seen the pictured cocoon, in its neat little, tight little leaf-covered shelter, and the mounted moths of scientific collections and museums; I knew their beautiful forms and remembered the reddish tinge flushing the almost black coat of the male and the red wine and clay-coloured female with her elaborate marks, spots, and lines. Right there the book stopped at leaf-fall early in November to await the outcome of those three cocoons. If they would yield a pair in the spring, and if that pair would emerge close enough together to mate and produce fertile eggs, then by fall of the coming year I would have a complete life history. That was a long wait, thickly punctuated with `ifs.'