on the ground near the nest. Amongst this material was part of the lining of nest No.5; this was sterilized by boiling. The birds accepted this material at once; Greenie especially, taking it in large batches. When it comes to lining, she seems to do as much work as Brownie. Platform. Lining pattern. About 10 A.M. I began building a platform at the nest. The birds minded this very little. I noticed that the lining programme was carried out in this way: First one bird took up material, placed it and formed it with its breast, then usually sat in the nest until the other arrived with a load, when that bird went through the same performance. It seems to me that sitting is part of the process, as previously noted, of giving the lining a permanent set. The fibre, being damp, readily assumesthe desired curvature. Roof. When the platform was finished, I placed a roof of "flexible glass"(wire screen glazed with a film of cellulose acetate) overhead to keep off the rain. This was a noisy and disturbing operation and the birds did not work while it was under way, but stayed in the vicinity, talking and sub-singing. I deferred placing a wind-screen in order to avoid too much interference at one time. Whenit is in- stalled, the birds will be comfortable and dry in all kinds of weather. After finishing for the day and cleaning up the debris, I sat down to watch the effect on the birds of the new addition to their home. No fear of structure. They came within a few minutes, got worms from me, then proceeded to dig around the footings of the scaffold and ladder in the earth I had turned up. B took up the first load, following the usual route up through the branches. G took her load up my ladder, then mounted by successive stages on various parts of the structure until she was opposite the nest, then jumped across to it. A very easy route, and quickly discovered. Neither bird appeared to notice the roof; so it looks as if I had got them under roof from the start.