JPMyers 1973 Journal Grid 1 (Farmhouse Puddle), Estancia Medland, 35 km S of Trencha, Ruta de Buenos Aires, Argentina 26 December confid apparent that the grid had dried somewhat since the last observation period, 24 December, particularly in the (0,1) area which was shallow to begin with. Now, where (0,1) there had been predominately, with a few mounds of dirt extending above surface water, the grid units are approximately: (0,0) - 80% water; (0,1) - 70%; (0,2) 50%; (0,3) 50%; (0,4) 50%; (0,5) 10%. I.e. Used the mean of the grid in the other areas of the grid are not noticeably different, because the water is somewhat deeper there. During the morning the clouds grew heavier, and by 0730 it was raining heavily. At 0745 I retreated. By then, however, I'd made 7 samples, as follows: Grid total: Pectoral 4.3 (4-5) 29; White rump 5.7 (3-8) 9; Microptiloma Bairdi 0.4 (0-3) 3; Microplama 0.4 (0-3) 3; Lesser Yellowlegs 1.3 (0-2) 9; Golden Plover 0.4 (0-1) 3; Southern Lapwing 1.0 (0-2) 7 (including); Kiskadee 0.4 (0-1) 3; C Pipit (0-1) 1. During the morning I recorded additional sets of data: 1) Sites of aggression — on an enlarged grid map I plotted the locations as could, the exact sites of acts of aggression between the part of my species recording the time and the species participating. It is not a complete account of the agonistic acts performed except as during some of the periods I was sampling. And some species, particularly, Pectorals & Lapwings, are better represented because of the relative ease of locating them. 2) Following data — selected individual records were followed, this position plotted every minute for 20-30 minutes. Both of these data were in the grid notebooks (with limited accuracy in species account). Aggression → the morning was repeated on 3 sheets, each covering 40 min of observation. Period 1: 0550-0630 35 total; Pectoral → Pectoral 13, Pect→WR 2, WR→WR 7, LYL→LYL 1, SL→Lapwing → WR 2 30 total Period 2: 0630-0710 Pect→Pect 11, Pect→WR 1, WR→WR 7, SL→Pect 4, SL→WR 4, SL→LYL 3 Period 3: 0710-0730 14 total Pict→Pect 7, Pict→WR 1, WR→WR 3, LYL→LYL 3. I left the grid at 0750 because the very hard rain was making observation impossible. During the morning a total of 10 mm fell between 0700 and 1400. I returned to the grid at that point. It was still raining (5 more mm fell during the afternoon). Added additional sample effects, including the effect of 10 mm on the grid was invisible, particularly in the (0,1) units which had previously dried considerably from their condition on 12/24. Although it does not the 10 mm has not completely reversed the drying trend, the grid