Buckland carried forward his work with the greatest zeal and energy. He writes in his journal: "I am now working from 8 A. M. to 6 P. M., then a bit in the evening,--fourteen hours a day; but, thank God, it does not hurt me. I should, however, collapse if it were not for Sunday. The machinery has time to get cool. The mill-wheel ceases to patter the water, the mill-head is ponded up, and the superfluous water let off by an easy, quiet current, which leads to things above." Salmon, which had formerly abounded in Wales and England, and been used extensively for food, had almost or altogether ceased to exist in many rivers. Buckland carefully studied their habits. He put himself, as he often said, in the place of the salmon. He waded the pools, to feel the force and direction of the current against which they come up from the sea into the rivers. He did not spare himself in storm or cold. "Most fish live either in fresh or in salt water; the salmon inhabits both. Bred in the higher waters of our rivers, the young salmon of one, two, or three years' growth make their way down to the sea as smolts, and return thence, impelled by the instinct of reproduction, to seek the gravelly spawning beds in the mountain streams. In early spring and through the summer and autumn months they come from the sea, bright-coated and silvery, and swim and leap and struggle up the rivers. Then is the fisherman's harvest. In winter the spawning time comes on, when the laws of nature and of man alike forbid their capture; for the fish, at other times so rich a luxury, are now vapid and unwholesome. Lean and flabby, the males with hooked beaks and scarred in fighting, the spawned fish, or kelts, rush down again to the sea; whence, after a while, they return, fresh and silvery, fattened to twice their former weight, and reënter the rivers as fresh-river fish, the joy alike of the fisherman and the epicure." Buckland constructed salmon ladders over the weirs, that the fish might have free passage from the rivers to the sea. He sent a series of models of these ladders to the American Fishery Commissioners, with five boxes of specimen oysters, and a photograph of his museum, with its casts and curiosities. He helped to obtain proper legislation from Parliament, both as to fishes and sea-birds; indeed all living things, especially those aquatic, had his sympathy and help. The results of his work were soon apparent. The yearly sales of English and Welsh salmon in Billingsgate market, London, before 1861, averaged about eight tons only. From 1867 to 1876 the average sale was eighty-eight tons. The sales of Irish salmon in Billingsgate, three hundred and fifty tons yearly; of Scotch salmon, over one thousand tons yearly. Thus was food provided for millions of people.