In a month the young alewives were about three-fifths of an inch long and by autumn between two and four inches. At three-fifths of an inch they look more like a sand eel than an alewife--an observation quoted in the same report. When they are an inch and a fifth long they look more like the adults. Their bodies are shorter at that size and they have a large head and relatively large eyes. When they reach one and two-fifths inches, about the size of those I saw, they look much the same, but with the addition of the alewife’s sawbelly--“serrations of the middle abdominal scales.” It may be that in times past little alewives have been unable to migrate out of the waters in which they were hatched, and local races of a landlocked variety were established. The landlocked alewives are much dwarfed in comparison with the salt-water variety. Some years ago there were a number of complaints from householders in New York City that small fish were coming out of the faucets. The Deputy Commissioner of the Department of Water Supply, Gas and Electricity, referred the matter to the New York Aquarium, which investigated and found that these were none other than landlocked alewives: _Pomolobus pseudoharengus_. They had been spawned in the Kensico Reservoir, and in the autumn they passed through the 5/8-inch mesh of the screens at the outlet. This might suggest the migrating habit of their ocean cousins. A friend of mine, getting the parent stream theory turned around, speculated as to whether a study might not show them returning from the same faucets over a period of years! But no conclusive evidence was found that these fish were following out any consistent migration. For a period of eight years during the course of the survey hardly any fish were reported as dropping into the kitchen sinks of New York. One interesting thing about the landlocked alewives is that they are subject to mass mortalities, or “die offs,” for reasons yet undecided. In some areas, like Cayuga Lake in New York State, this happens occasionally, but in others, Lake Ontario, for example, fairly regularly. This does not necessarily happen after spawning, so invites no analogy to the west coast salmon. Many of the dead fish have not yet reached sexual maturity. As to the normal, coastal migration of the fry from fresh to salt water, why do they leave when they do? Is there any theory that can account for these little fish suddenly moving out of the waters in which they were born, so rich with the fresh-water food that gave them their initial growth? Are they fleeing their enemies? Yet the young of the fresh-water fish are preyed upon too, and they stay behind.