May 14 - D.C. Dr. Fisher estimates that there are 3 breeding pairs of birds to the acre, or about 100 individual adults before the young are out. Of course just now there are more; I should say all together fully 20 to the acre. Drives of warblers scatter through the tree-tops one after another. Made several excursions during the day to the Maryland mainland, and in the evening walked several miles towards Washington along the canal on the Maryland side of the Potomac. Saw birds as follows: Carolina Wren (a brood of 4 young around a building; they could scarcely fly and were being stalked by a cat); Indigo Bunting (at least 6 brilliant males foraging in open places along the