There are two streams falling into the seining pool. Both start as pond outlets some fifty yards above, one with the fish ladder going down from it, and the other falling into a pool that ends above the old mill, the water of which can be used to run the water wheel on occasion by being diverted to a wooden sluiceway, instead of taking its natural course down over rocks into the seining pool. This second stream cannot be traveled by fish going up to spawn although they can go down it on their return journey. One weekend I watched the fish at the top of the ladder as they jumped over the board dam, to meet at last the quiet stretch of pond water above it. The waters were growing green with algae as the season developed, and were penetrated by deep shadows, blue shafts from the sun, yellow and pink reflections from the spring leaves on the bank. Some were unable to make it and slipped back into the rushing, narrow flow in the ladder, and then tried again. Jumping the dam, they would give a final, vibrant, struggling push into the smooth, heavy weight of water over the rim and then shoot off, wriggling away, easing into a new peace. The impetus of this leap was enough to send some of them skittering along the flat surface on their sides, like skimmed stones. Others going into the pond would start back again toward the head of the ladder, and then return and wait a while as if they wanted company. As some new arrivals came they would swim a kind of half circle in relation to them, and then all would go on, having established a communication; but the general movement was a bolt into deeper water and then a rejoining into groups as they went on. After that, where do they go? As far as fish migration in general is concerned the spawning route beyond Stony Brook is not very great. Roughly, the distance from the outlet through Lower Mill Pond and Upper Mill Pond to the end of Walker’s Pond is about two and a quarter miles. Upper Mill is the largest of these, being about one and a half miles long and a quarter mile wide. Where the fish spawn in this area is not too easy to find out at first. Their preference as to spawning grounds seems to lie along stony, pebbly shores, or shallow beaches. Many of them, before spawning, will travel to the farthest reaches of any given water route. Others, depending perhaps on how far the season is advanced and on their bodily development, will either go the entire distance and then return part way, or spawn before they get there.