presumably remaining from July and, if we further assume that the immature 
population has not yet begun to leave the island (which seems justified 
by observational data) the result is the percentages given in the second 
column of the table. It follows from the figures given in the first two 
columns that not less than 305? of the July nests observed in August should 
have contained small downy young. (At least 26 of 100 nests should have 
contained small doxmy young from eggs hatched since our last visit. It also 
seems reasonable to assume that at least 4 of 100 chicks recorded in July 
would still be classified as small downy young, particularly since newly 
hatched young and small downy young were counted as one age class on that 
visit.) 
We observe in column two, however, that only 23 of 100 of the July 
nests observed in August contained small downy young, a discrepancy of 
about 25% from our expectations. Further, the totals of large downy 
young and immatures of the July population in July (58 of 100) are 
greater in August (74 of 100) at about a rate consistent with our 
expectations (considering that the immature class for July is subject to 
greater bias in estimate than are the other classes.) 
The area covered by the nest count,which was made during the night 
of 17 August, primarily covered the island perimeter. The count was 
made from a point opposite the Sooty Tern colony on the west beach, 
thence south along the west shoreline , around the south end of the 
island and up the east shore to a point approximately 50 to 100 yards 
north of the starting point on the west beach. We estimate that about 
70 to 75/* of the island perimeter was covered during the count. 
The count area was arbitrarily divided into four sections to compare 
nesting density and stage of reproductive cycle from area to area. The 
area "West-Central, comprising about 15% of the island perimeter, extended 
from the Sooty Tern colony on the*west side of the island to the campsite, 
located about 100 yards south of the Earhart Light. The area "Southwest" 
extended from the camp to the point at the south end of the island where 
the island begins to curve to the east and which is marked by a area of 
rough coral rubble and a large driftwood log. This area also comprised 
about 15# of the island perimeter. The area "South" extended across the 
south end of the island to a point approximately eastward and perpendicular 
to the driftwood log. This area comprised from 10 to 15 % of the count 
