The pond is like a weight wound up.

February 28.

P. M. —To Nut Meadow. 

How various are the talents of men! From the brook in which one lover of nature has never during all his lifetime detected anything larger than a minnow, an other extracts a trout that weighs three pounds, or an otter four feet long. How much more game he will see who carries a gun, i. e. who goes to see it! Though you roam the woods all your days, you never will see by chance what he sees who goes on purpose to see it. 

I go on the crust which we have had since the 13th, i. e. on the solid frozen snow, which settles very gradually in the sun, across the fields and brooks. 

The very beginning of the river’s breaking up appears to be the oozing of water through cracks in the thinnest places, and standing in shallow puddles there on the ice, which freeze solid at night. The river and brooks are quite shrunken. The brooks flow far under the hollow ice and snow-crust a foot thick, which here and there has fallen in, showing the shrunken stream far below. The surface of the snow melts into a regular waved form, like raised scales. 

Miles is repairing the damage done at his new mill by the dam giving way. He is shovelling out the flume, which was half filled with sand, standing in the water. His sawmill, built of slabs, reminds me of a new country. He has lost a head of water equal to two feet by this accident. Yet he sets his mill agoing to show me how it works. 

What a smell as of gun-wash when he raised the gate! He calls it the sulphur from the pond. It must be the carburetted hydrogen gas from the bottom of the pond under the ice. It powerfully scents the whole mill. A powerful smelling-bottle.

How pleasant are the surroundings of a mill! Here are the logs (pail stuff), already drawn to the door from a neighboring hill before the mill is in operation. The dammed-up meadow, the melted snow, and welling springs are the serf he compels to do his work. He is unruly as yet, has lately broken loose, filled up the flume, and flooded the fields below. He uses the dam of an old mill which stood here a hundred years ago, which now nobody knows anything about. The mill is built of slabs, of the worm-eaten sap-wood. The old dam had probably been undermined by muskrats. It would have been most prudent to have built a new one. Rude forces, rude men, and rude appliances.   

That strong gun-wash scent from the mill-pond water was very encouraging. I who never partake of the sacrament make the more of it. 

How simple the machinery of the mill! Miles has dammed a stream, raised a pond or head of water, and placed an old horizontal mill-wheel in position to receive a jet of water on its buckets, transferred the motion to a horizontal shaft and saw by a few cog wheels and simple gearing, and, throwing a roof of slabs over all, at the outlet of the pond, you have a mill. 

A weight of water stored up in a meadow, applied to move a saw, which scratches its way through the trees placed before it. So simple is a sawmill. A millwright comes and builds a dam across the foot of the meadow, and a mill-pond is created, in which, at length, fishes of various kinds are found; and muskrats and minks and otter frequent it. The pond is like a weight wound up.

H. D. Thoreau, Journal,  February 28, 1856

You never will see by chance what he sees who goes on purpose to see it. ... Compare:

August 5, 1851 ("The question is not what you look at, but what you see.”);

August 21, 1851 ("You must walk sometimes perfectly free, not prying nor inquisitive, not bent upon seeing things")
November 18 1851 ("The chopper who works in the woods all day is more open in some respects to the impressions they are fitted to make than the naturalist who goes to see them. He really forgets himself, forgets to observe, and at night he dreams of the swamp, its phenomena and events. Not so the naturalist; enough of his unconscious life does not pass there. A man can hardly be said to be there if he knows that he is there, or to go there if he knows where he is going. The man who is bent upon his work is frequently in the best attitude to observe what is irrelevant to his work.");

September 13, 1852 ("I must walk more with free senses. I must let my senses wander as my thoughts, my eyes see without looking. Carlyle said that how to observe was to look, but I say that it is rather to see, and the more you look the less you will observe. Be not preoccupied with looking. Go not to the object; let it come to you. What I need is not to look at all, but a true sauntering of the eye.”);

March 23, 1853 ("Man cannot afford to be a naturalist, to look at Nature directly, but only with the side of his eye.”);

June 14, 1853 (". . . you are in that favorable frame of mind described by De Quincey, open to great impressions, and you see those rare sights with the unconscious side of the eye, which you could not see by a direct gaze before.”);

December 11, 1855 ("I saw this familiar fact at a different angle. It is only necessary to behold thus the least fact or phenomenon, however familiar, from a point a hair’s breadth aside from our habitual path or routine, to be overcome, enchanted by its beauty and significance. To perceive freshly, with fresh senses, is to be inspired.”);

Apirl 8, 1856 (" Most countrymen might paddle five miles along the river now and not see one muskrat, while a sportsman a quarter of a mile before or behind would be shooting one or more every five minutes.");

April 13, 1860 (“It distinctly occurred to me that, perhaps, if I came against my will, as it were, to look at the sweet-gale as a matter of business, I might discover something else interesting.”)