C. G. Loran Station, Sand Island, Johnston Island Atoll Revised bird population estimates are given on the accompanying DATA SHEET. Ken Wilz observed the Frigates again after repairing the "blind" which had fallen apart after Saturday's rain. After lunch we cut the leg markers in preparation for banding tonight. Several were tried on Sooty Terns, Wedgtails, and Red-tailed Tropicbirds so as to get the correct fit. They appeared to fit fine and one can see the markers quite well at a distance. Five to six hundred markers for Sooty Terns were cut. After supper the Shearwater burrows were again checked. Pat Elliott also did some sketching. After dark (9 p.m.) we began banding adult Sooty Terns and color marking them: (F and W band on right leg: color marker on the left). It was decided (after trial) to place the marker on the left). It was decided (after trial) to place the marker on the femur to keep it from dragging when the terns walked. We worked in pairs: one catching and the other banding and marking. The time spent was tripled compared to just banding. It took Pat and I three hours to band and work two hundred terns where it normally takes only one hour to do two hundred. In all we banded and marked four hundred adult Sooty Terns before quitting a little after twelve midnight. July 23, 1963 This morning the weather is quite different than usual--it is overcast and appears it will rain. I worked over a Berlese Sample of beach sand and found an interesting acarine which I had never