641 one of them was shifted a few inches by the birds themselves to occupy a new foundation provided by me. Though in this latter case, it is only fair to say that the birds were crowded in the original chosen location and could not have built a full-sized nest there anyway. 12:30 P.M. As the noon whistles sounded, Brownie was up in the old oak singing after having fed the young birds. Glancing toward the nest, I saw the new thrasher going up to it with material, apparently without any special inducement on the part of B. He came down and the two birds worked together for the few minutes longer t that I watched. 3:35 P.M. Curiously enough, just three hours afterward, almost the same thing occurred, the new bird not havig been seen in the mean- time. The only difference on this occasion was that she joined B after working for several minutes at the nest by herself, and B continued to sing. This bird, tentatively designated as Nova, after the custom of astronomers in naming a "new" star in a constellation, does not behave as Greenie might reasonably be expected to behave; even after an absence of 2 weeks). She makes long detours to get around me, is ex- tremely shy, uses none of the favored perches of Greenie, pays no attention to the young birds, does not come to the food dishes, is much less often in the open, helps much less in nest building at present and is more silent. In addition she seems to keep away from B unless called repeatedly and then usually goes off by herself within a few minutes. I have not been able to see her eye color. Greenie, even when she first appeared here and before she would come for food, showed some inclination to come toward me when invited. In the nest they are using fibres exclusively, though there is a superabundance of good twigs available. I have had to replace the soap-root fibres three times, i.e.: furnish 3 lots, each a good hand- radically ful three times in about 4 hours. The nest is already entirely