But about this time I had an experience which taught me that nature is not always kind. One day my teacher and I were returning from a long ramble. The morning had been fine, but it was growing warm and sultry when at last we turned our faces homeward. Two or three times we stopped to rest under a tree by the wayside. Our last halt was under a wild cherry tree a short distance from the house. The shade was grateful, and the tree was so easy to climb that with my teacher's assistance I was able to scramble to a seat in the branches. It was so cool up in the tree that Miss Sullivan proposed that we have our luncheon there. I promised to keep still while she went to the house to fetch it. Suddenly a change passed over the tree. All the sun's warmth left the air. I knew the sky was black, because all the heat, which meant light to me, had died out of the atmosphere. A strange odour came up from the earth. I knew it, it was the odour that always precedes a thunderstorm, and a nameless fear clutched at my heart. I felt absolutely alone, cut off from my friends and the firm earth. The immense, the unknown, enfolded me. I remained still and expectant; a chilling terror crept over me. I longed for my teacher's return; but above all things I wanted to get down from that tree. There was a moment of sinister silence, then a multitudinous stirring of the leaves. A shiver ran through the tree, and the wind sent forth a blast that would have knocked me off had I not clung to the branch with might and main. The tree swayed and strained. The small twigs snapped and fell about me in showers. A wild impulse to jump seized me, but terror held me fast. I crouched down in the fork of the tree. The branches lashed about me. I felt the intermittent jarring that came now and then, as if something heavy had fallen and the shock had traveled up till it reached the limb I sat on. It worked my suspense up to the highest point, and just as I was thinking the tree and I should fall together, my teacher seized my hand and helped me down. I clung to her, trembling with joy to feel the earth under my feet once more. I had learned a new lesson--that nature "wages open war against her children, and under softest touch hides treacherous claws."