of fresh and incubated eggs present in August. A distinctly higher proportion 
of the clutches found along the east shoreline were fresh compared with 
clutches found in the Southwestern area (and to a lesser extent clutches 
found in the Southern area. 
3. The Southern area, like the Eastern area, seems to be an area in 
which egg laying has been more recent than in other areas and is an 
area which seems less favored as nesting habitat. 
4. The West-Central area is an area of somewhat greater nesting con - > 
centration than the Eastern and Southern areas. It may also have been an 
area in which nesting increased rapidly during the spring but also may 
be an area in which the cycle is not so prolonged. 
Among other data‘taken on Blue-faced Boobies on the night of August 
l?th was a comparison of the size of eggs from one-egg and two egg 
clutches. Despite the relatively small sample size, a clear relationship 
seems to exist between size of egg and size of clutch. These differences 
are presented in the table given below; 
Differences in Egg Dimensions of One and Two Egg Blue-faced Booby Clutches* 
Length _ Width 
O-ne egg 
Two-egg 
One egg 
Two egg 
clutches 
clutches 
clutches 
clutches 
Maximum 
71.8 
69.8 
47.2 
46.4 
Minimum 
65.1 
55.1 
4l 0 6 
39.6 
Mean 
67.7 
65.1 
44.5 
42.8 
Number in 
sample 
6 
15 
6 
13 
« 
* all measurements taken to the nearest tenth of a millimeter with direct 
reading dial calipers. 
