56 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
In 1899-1900 Mr. Agassiz made a further expedition to the Pacific 
in the ‘“ Albatross,” visiting the Paumotus, the Tonga or Friendly 
Islands, and Guam in the Ladrones.1 Through arrangements made 
with Professor David and Mr. Agassiz, by Professor Judd, I have been 
able to examine a small selection of the limestones collected by Mr. E. C. 
Andrews in the Fijis, and by Mr. Agassiz in the Paumotus, Tongas, 
Ladrones, etc. 
Professor David, on his first expedition from Sydney to Funafuti, 
visited Niue (Savage Island), and collected limestones from ravine 
sections and from faces of the raised terraces. These specimens I have 
examined, and during a recent visit to England Professor David was so 
kind as to make sketches of the island for me, illustrating the horizons 
from which the limestones were collected. 
Throughout this work I have received from Dr. Cullis, who has had 
considerable experience with the Funafuti specimens, valuable advice, 
which I am anxious to acknowledge. I am also indebted to Mr. Fred- 
erick Chapman for the specific identification of some of the Forami- 
nifera, while Mr. Franklin T. Barrett and Mr. C. Davies Sherborn have 
helped me with many valuable suggestions. To Professor Judd my 
best thanks are due, not only for giving me the opportunity of making 
this research, but also for valuable help and advice throughout the 
progress of the investigation. 
Hisroricat Inrropuction.— The very early work of Hatchett ? dealt 
with the chemical composition of the skeletons of various organisms, 
including corals, but his analyses were only qualitative, and his results 
are only distantly related to the present inquiry. Many years elapsed 
before another investigator published any results bearing on corals or 
coral reefs. 
The next contribution was from Prof. J. D. Dana— Geologist to the 
United States Exploring Expedition (Wilkes), 1837-42 — who made an 
extensive collection of corals and coral rocks from the islands visited 
during the voyage, including limestones from the raised coral island 
of “ Metia” (Makatea). The specimens were analyzed by Benjamin 
Silliman, Jun., and Professor Dana made a first reference to the results 
in an address to the Association of American Geologists and Naturalists, 
at Albany, in 1843.2 The work was incomplete, and no analyses were 
1 Mem. Mus. Comp. Zool., Vol. XXVI., No. 1, 1902, and Vol. XXVIII. 
1903. 
2 Chas. Hatchett, Transactions Royal Society, Vol. XC., 1800, p. 827. 
8 American Journal of Science and Arts, Vol. XLV. 1848, p. 120. 
