previous low of the November-December 1965 cruise (1.15 birds/linear mile). 
Although total numbers during the present cruise were not drastically 
different from November-December, a.considerable change was apparent in 
the representation of the various species groups. Shearwater-Petrels 
were very scarce and accounted for only 5*5 percent of the total birds, 
compared to the over 48 percent during November-December. Terns, however, 
accounted for over 68 percent of the total as apposed to only 28 percent 
during November-December. Practically all other groups remained essen¬ 
tially the same. The movements of Shearwater-Petrels to southern breeding 
areas and the concomittant return of the Howland Island breeding population 
of Sooty Terns probably accounts for the change-over in numbers of the 
two major groups. 
Hough seas encountered throughout the Grid survey period prevented 
the use of the small skiff for collecting purposes. Likewise, conditions 
were unfavorable for the placement of oil slicks for the purpose of attrac- 
ing birds, primarily storm petrels. The starboard engine on the SHEARWATER 
was inoperable during the period 4-8 February and reduced speeds were 
necessitated during this time. The combined unfavorable weather conditions 
and mechanical difficulities account for the low number of birds collected. 
