The day a/ter we arrived here, a boat from the ,lssi. San Antonio conveyed Mr. Montgomery and.Jone?a Mr. Cunningham to Clack's I?i?nd. The reef abounded with abel]s, of which they brought back a large collection, but not in any great variety; an indifferent c?pr2a was the most corn- molt; but there were also some volui? and other shells, besides trepang and astzr/?, in abundance. Mr. Cunningham observed a singularly curious cavern upon the rock, of which he gave me a de- w-dption in the following account of the island :-- �' The south and south-eastern extremes of Clack's'Is!?d presented a steep, rocky bluff, thinly covered with small trees. I ascended the steep head, which rose to an elevation of a hun- dred and eighty feet above the sea. I found simply the plants of the main, v/?., ? par- . ?/fo//a, Br.; /?a ,?, Cu?. MS.; ac?a?z ld?- ?, Cunn. MS.; chionanthas ?llaris, Br.; ?te?a p?mtata, Br.; some a?xiv?, and the small orange-fruited f?c?, which grew in the thi&ets, and, by insinuating its roots in the interstices of the rocks, clothed a great portion of the inacces- sible front of the island. "The remarkable structure of the. geological feature of this islet led me to examine the south- east part, which w? the most exposed to the wea- ther, and where the disposition of the strata was
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