Bathymthermograph casts were made at four-hour intervals in the central and southern portions of the Grid. For reference the BT slides were photographed individually against the calibrated Grid and printed on 8 x 10 contact sheets. A copy of these prints is included with this report as Figure 3. All positions on this survey and on EGS 10 and 11 are LORAN fixes. LORAN accuracy on the first third northern leg is poor. All other fixes are considered accurate within the limits of LORAN (2 to 5 milestog). Results of Discussion During diurnal observations from the tugs and YAG of 109.1 hours and 957 miles 452 birds were recorded. These observations are summarized in Table 1. The observations from the two vessels are treated equally. No discussion of the validity of such treatment is undertaken at this time. Nocturnal observations are summarized in Table 3. Again on this survey diurnal coverage was good in each of the nine sectors of the Grid. Numerical abundance and densities of species groups are included in Tables 4 and 5. North-South and East-West sectional breakdowns are Tables 6 and 7. About 46 percent of the observations were recorded in the northern third of the Grid. A near-equal percentage of observations was recorded in the eastern third. The previously recorded northward movement of storm petrels and their concentrations around Point Dogwood during EGS 10 and Point Ash on EGS 11, plus the presence of most of the phalaropes recorded in the northern and eastern sections strongly suggests the presence of "richer" waters in the northern third of the Grid. The same is generally true of the eastern third of the Grid. The cause for this is believed (without concrete evidence at this time) to be that both of these areas lie in more active areas, i.e., faster flowing, of the California Current. The faster currents affect the north section of the area, then around Point Conception and shift eastward. It then asserts strong influence only on the eastern third of the area. If this rambling hypothesis be correct it would explain bird abundance on the basis of environment rather than by proximity to land masses (which seems a weak explanation for distribution of many recorded pelagic sea-birds). The recorded abundance of Storm Petrels in the southwest section (sector 7) of the Grid is not valid. On 2 September the skiff was used for four hours; during this time 47 percent of the day's total was recorded. This was effected as follows: The seas were calm, increasing the radius of visibility by possibly 2K; the ship was running at 7K, allowing the skiff to work up to 2+ miles on each side of the ship - this again increasing the radius of observation. As all birds seen from the skiff were radioed to the ship and recorded there, it effectively increased the number of birds recorded by two to four times. No effort was made to adjust these data in the presentation as this is difficult to achieve with statistical significance. Ten Storm Petrels, one Red Phalarope, and one Cook's Petrel were collected in seven hours of skiff operation on two separate days.