Childs 1957 Lemmus 4. June 12 Wainwright, Alaska (C. M.) Here, then a large, constructed population is exposed, giving the impression of great abundance as seen by the Eskimo catch. Within a few weeks, the marsh is again inhabitable, some growth of grass has taken place, and the Lemmus can re-invade the marsh area. Thus the abundance which we have seen is due to the time we got here this year and expanding the area and not due to a great fluctuation in population density. A check later in the summer would be of great value in proving this hypothesis. The population here seems fairly stable since 1953, which is somewhat puzzling. The few Lemmus we have taken in the marsh have been on welldeveloped polygons with good burrowing sites, and there were 2 large adults, 1 medium sub-adult. The bigger animals could maintain themselves on these few favorable sites and did not have to move. If this theory is true, a later check