Then, without another word, we turned in through the wooden door at the back of the great yew hedge. As we entered I heard such a twittering and indignant chirping, that I was thoroughly puzzled to guess the cause. The children and I peered through the branches. "There must be a cat somewhere," I said. I have read that birds will chatter round a sick cat or dying fox, but I could discover no beast about. At our approach, two brilliant greenfinches alone took flight with a beautiful flash of apple-green wings, and vanished into the recesses of the great walnut tree. Still the harsh discordant cries continued. Suddenly I saw a nest. "A nest!" I cried, "and the noise comes from there. What can it be?" I tried to touch it, but the nest of moss and twigs was beyond my reach. "We must get the steps and then we shall know what makes the noise," I said. "But only Mouse amongst the dogs may see; Tramp and Tartar must be shut up in the shed, for if the birds fluttered down or could not fly, they would kill them, before we could save them." We shut up the terriers and fetched the steps. "I wish," I said, "that one of the boys"--as Burbidge calls them--"were here to hold them." For the ground at the back of the hedge was uneven, and it was difficult to get the steps reared firmly up. "I'll hold them, dear," said Hals, politely. And added with pride, "You know I'm very good at doing any man's job." But as they were heavy and rather clumsy, being an old-fashioned pair, I declined this and begged Hals to get out of the way, for fear of an accident happening to him. Then I mounted. I reached the summit of the ladder and looked down into the nest. As I did so I was conscious, at the "back of my head," as Nana says, that the children were watching me intently. "What is it?" they cried breathlessly. I saw below me a greenfinch's nest made out of green moss and twigs and lined with cow's hair, and in it, filling almost the entire space, was a gigantic grey-barred bird with an enormous mouth, which he opened at me in great wrath. Nothing daunted, I stretched out my hand to seize him, and obtained my prize; but in the effort, of doing so, I overbalanced myself, the steps clattered down with a crash, and I fell, bird in hand, to the ground. In my endeavour to save the bird from harm, I came in contact with a projecting piece of lime rock. I felt a sharp pain in my right knee, and then a giddy, confused sensation possessed me, and a hundred lights, red, blue, and white, danced before my eyes. The bird escaped from my hand and fluttered into the hedge with a guttural cry. Hals and Bess approached me in terror. "Mum, Mum, you're not dead?" asked Bess. I saw the little face twitching above me, and as she spoke, hot tears ran down her cheeks.