Dendroica castanea 1896, May 29. Lake Umbagog. Mason logging woods. Building. Watrous this morning saw a female Bay-breast at work on a nest in the Mason logging woods. June 4. copy 6 Lake Umbagog. Near Pine Point. We then retraced our steps to the knoll by the big boul- der where the Black-burnian and Bay-breasted Warblers are so numer-ous. Here we spent the remainder of the forenoon making an ex-haustive (and exhausting) search for nests, pounding hundreds of trees with an axe in the hope of starting the sitting birds. This plan failed utterly (we afterwards learned by actual experiment that these Warblers will not leave their nests even when the trees in which they are placed are pounded vigorously) for we did not find a single nest of any kind. There were at least a dozen Bay-breasts and an even greater number of Blackburnians singing on this knoll within an area of eight or ten acres. 106