Bratley, D.A. 1964 Sand Island, Johnston Is. Atoll (Notes) Mon. July 13 (cont) p.3 hatched today. This was the same nest we planned to do change-over studies on, but will now be unable to do this. The chick was a ball of black fuzz & the same size as the one found last night. Sooty Tern — for the past week now nearly the whole population will rise from the island with no disturbance at all. This mass flock will hover in the air & spread out to about twice the dimensions of the island. After a few minutes they settle back to the ground. Any type of disturbance or noise, like the jet attack bombers which have recently started to take off & land on Johnston will cause the same behavior. This must mean they are becoming restless & preparing to depart. Already large areas (Northeast peninsula, Southwest portion of island) are almost completely devoid of birds in the daytime & very sparsely populated at night. During the daylight hours, the population = decreases considerably over the whole island, but at night it builds up to a dense population again, however, it is noticeable that nightly population is decreasing too. Tues. July 14 Sand Island - Bulwer's Petrel — both nests which now have young birds were