it to be abandoned in favor of some unknown new location. On the other hand, it has been pointed out that 8-37 is cramped for space (particularly now that it is so bulky) and that R, being acutely aware of that fact, has extended it. We are now, therefore, confronted with the problem: Does Rhody "consider" that this is a new nest and does this extension satisfy whatever urge it is that impels him to abandon one nest and to start another, or is it the same old one? Is this still 8-37, or is it 9-37. Is it 8-37 physically, but 9-37 "spiritually"? The little Anna's hummer, being now full of pep and able to hover in one spot was released at 9:30 A.M. He flew to a wild iris flower at once and behaved with professional precision, thence directly upward to perch 10 feet up in an oak. At 10:10 Rhody was very kittenish when I called to see him in this new creation of his, and ran back and forth between the two (?) nests. When I turned away he followed to the tool-house, without a pause. I walked at a rate of about 4 miles per hour, or perhaps somewhat faster. He did not need to break out of his trot to keep pace. (This distance traversed by the route taken is, by scaling the topographic map which I had made of this property in 1926, precisely 86.5 yards). This mouse was received with cere- mony and he also knew just what he wanted to do with it, which was to take it to the Scamell window first, then to his house in the roost tree, where he arrived at 10:25. By the route taken, about 200 yards. Leaving Rhody, I went to Mr. Sampson's to look at his thrashers. Thrashers have nested at his place for 3 or 4 (?) years, and we have thought that Brownie was perhaps their male progenitor. They have two youngsters and Mr. Sampson has suggested, that as they will inevitably be driven away from his place, I take them at the proper time, keep them for a short time in the aviary and then release them, and one or both of them may adopt this as their ter- ritory. (I think it probable that B will have a successor here any- way, since thrashers are seen here now and then and it does not seem probable that they will overlook the possibilities). I found two strapping youngsters in the nest, eager for food, and gave them meal-worms, their parents not objecting very serious- ly and shortly permitting me to stand on the ladder without their de parting, with face 2 feet from the nest, an adult in the nest. The chicks can not swallow, as yet, anything merely placed in their mouths, but, if offered a finger at the same time, use that as a ramrod. May 14th to 16th., incl. On the 14th. Dr. Grinnell arrived here about 7:45 A.M. to accompany me on a short run into the Sunol Valley in the S.E. portion of this county. Rhody was already observing affairs from the chimney top. He had not been in his night roost at 5:30 A.M. In summer and spring he is a much earlier bird than I am, but not in winter. Before we left (7:58 A.M.) Rhody had installed him- self comfortably in 8-37 with no apparent intention of coming down at all. On my return here at 3:30 P.M. I found him loafing at the north side of the house without the slightest interest in mice or me, so I left him to his own devices for the rest of the day. Julio says he was given nothing during my absence as he was away all of the time. In going through Niles Canyon on our run, I was surprised