The Fork-tailed Petrel resorts to its breeding stations to nest in June. Although gregarious during this period, its colonies are never so large as those of the Fulmar. Most probably the bird pairs for life, and returns season by season to certain spots to rear its young. The largest colony of this Petrel known to me is at St. Kilda. Here its principal colony is located on the island of Soay, but there is another and smaller one on Doon, and doubtless others on Borreay. At the colony on Doon, the ground was full of long, winding burrows, probably disused nesting holes of Puffins and Shearwaters, and in these the Fork-tailed Petrels had made their nests—in some cases one earth accommodating several pairs of birds. Usually the selected burrows are in the loamy soil near the summit of the cliffs; but, in some cases, the birds will select a hole, or crevice, in ruined masonry, or in rocks. At the end of the burrow, or crevice, a scanty nest of dry grass is formed, but in some cases no provision whatever is made. Here the female deposits a single egg, white, with a zone of dust-like brown specks round the larger end. These eggs are remarkably fragile, and very chalky in texture. The Fork-tailed Petrel is a close sitter, remaining brooding over its egg until dragged out. Many nests may be found within an area of a few yards. This Petrel is not seen abroad much at its breeding places during daylight; all day long the little birds skulk in their burrows, but with the approach of night, they begin to sally forth from their retreats and nests, and their fluttering forms may be seen flitting to and fro in the deepening gloom, backwards and forwards, to and from the sea. The Fork-tailed Petrel is not a very noisy bird. Those that I dragged from their nests uttered a few squeaking notes; but at night the species becomes more garrulous. But three breeding stations of this Petrel are known—one in the North Pacific, another in the Bay of Fundy, and the third within the British area. Its migrations are limited. STORMY PETREL.