TRUK. 355 



these rise to a considerable height. Uola is over 1300 feet, Toloas 

 rises to 1200, Ruk to nearly 1000, Umol to over 800, Udot to about 

 1000, and the large island of Tol has several peaks, the highest of 

 which is more than 1200 feet (PI. 231). In additioit to the large vol- 

 canic islands, a number of smaller islands are scattered through the 

 atoll, such as Eiol, Periadik, Tarik, Ulalu, Fala, and others, rising from 

 twenty to 300 feet above the level of the sea. The names given to the 

 islands in the lagoon of Truk and on the Royalist atoll — such as Quoy, 

 Gaimard, Brongniart, Gaudichaud, Bouquet, Givry, Hacq, Lauvergne, Ber- 

 trand — are many of them names associated with the " Astrolabe and Zelee " 

 expedition in the early part of the past century; a survey of Truk was 

 made in 1838, by Dumont D'Urville, who spent considerable time in 

 this atoll. 



Uola, the largest island on the eastern half of the lagoon, is triangular, 

 a little over four miles in length and about three and one-half miles wide 

 on its western face. The principal ridge of the island extends parallel to 

 the southeastern face (PI. 192, fig. 2) ; it is separated by a deep valley, cut 

 down almost to the level of the sea, from Mount Ton Azan, the summit of 

 which forms the northern extremity of the island (PI. 191, fig. 3). Uola 

 is surrounded by a fringing reef, as are all the other volcanic islands in 

 the group we have examined ; here and there the disconnected fringing 

 reef flats are separated by short stretches of coral sand beaches. The 

 smaller islets in the eastern half of the lagoon from Eo north are simi- 

 larly edged with a fringing reef (PI. 231). 



A steep beach of fine yellow coral sand extends on the west coast of 

 Uola from the village to the northern extremity of the island. About 

 100 feet back of the water line the beach reaches its greatest height ; 

 it is covered in many places with loose masses of broken coral of small 

 size, mainly Madrepores and Porites. A beach of the same character 

 extends along the greater part of the west face of the island towards 

 the southern point. Back of this, fine coral sand mingled with volcanic 

 particles, washed down from the adjoining slopes, extends to the foot 

 of the mountain slopes. This platform of coral and volcanic sand is 

 somewhat lower near the foot of the mountain slope than it is near the 



