might be ascribed to the chilling wind passing upward through the bottom of the nest. Brown Watched the nest from 4:45 to 5:30, green-eyes being its occupant. She examined the eggs and probed along them at times during during all of this period. She dozed frequently, closing her eyes and resting the end of her bill on the rim of the nest. When she naps her respiration is slower and deeper. It varies between 60 and 70 per minute while sitting quietly in the nest, but drops to about 50 when she dozes.(This is from one set of observations on which only). With no previous experience to base an opinion, this impresses me as being slow for a creature with such active life processes. Her hearing does not appear to be any more acute than mine(for sounds within the range of frequencies perceived by the human ear). I can, of course, only judge only by noting to especially what sounds she reacts. Near the end of a shift she is on the alert for signs of the approach of her mate and very visibly both accidental and intentional sounds made by him reacts to them by some movement of the head, such as turning it to locate the source of the sound or to look for him. Frequently I hear him before she shows any signs of having done so. For example: He may make two sweeps with his bill in the dead leaves in the glade below on his return from a foraging expedition, both audible to me. She may react to the first, or to the second only, or to both or neither, even when she is manifestly on the lookout for his re- turn. This, of course, proves nothing, as she may be hearing him all the time without reacting physically. When Green-eyes stepped into the nest at 5:30, he looked over the eggs rather casually, more, it appeared, to see what had happened during his absence than to investigate future prospects. He did not touch them with his bill, settled much more quickly and less firmly than Brown-eyes does and spread out his feathers much less. As usual, he faced north directly opposite to Brown-eyes' usual facing. This is almost characteristic difference when the wind is in the south, as it has been