The birds and animals are all friendly to each other, and there are no disputes about anything. They all talk, and they all talk to me, but it must be a foreign language, for I cannot make out a word they say; yet they often understand me when I talk back, particularly the dog and the elephant. It makes me ashamed. It shows that they are brighter than I am, for I want to be the principal Experiment myself--and I intend to be, too. I have learned a number of things, and am educated, now, but I wasn't at first. I was ignorant at first. At first it used to vex me because, with all my watching, I was never smart enough to be around when the water was running uphill; but now I do not mind it. I have experimented and experimented until now I know it never does run uphill, except in the dark. I know it does in the dark, because the pool never goes dry, which it would, of course, if the water didn't come back in the night. It is best to prove things by actual experiment; then you _know_; whereas if you depend on guessing and supposing and conjecturing, you never get educated. Some things you _can't_ find out; but you will never know you can't by guessing and supposing: no, you have to be patient and go on experimenting until you find out that you can't find out. And it is delightful to have it that way, it makes the world so interesting. If there wasn't anything to find out, it would be dull. Even trying to find out and not finding out is just as interesting as trying to find out and finding out, and I don't know but more so. The secret of the water was a treasure until I _got _it; then the excitement all went away, and I recognized a sense of loss. By experiment I know that wood swims, and dry leaves, and feathers, and plenty of other things; therefore by all that cumulative evidence you know that a rock will swim; but you have to put up with simply knowing it, for there isn't any way to prove it--up to now. But I shall find a way--then _that _excitement will go. Such things make me sad; because by and by when I have found out everything there won't be any more excitements, and I do love excitements so! The other night I couldn't sleep for thinking about it.