136 The American Geologist. March, 1905 
On February i, 1900, Hatcher accepted the position of 
curator of paleontology and osteology in the Aluseum of 
the Carnegie Institute, Pittsburg, Pennsylvania. Here he 
had the generous support of the founder of the museum, 
and for four summers carried on explorations in the west- 
ern states. Most of his papers were written while at Pitts- 
burg, and one of the best is the description of Diplodocus 
carnegii. It is Mr. Andrew Carnegie's wish that a life-size 
reproduction of this animal, based on the Pittsburg speci- 
men, be presented to the British Museum of Natural 
History. During the 18 months previous , to last July, 
Hatcher had been supervising the making and mounting of 
this great restoration, which was completed while he lay 
on his sick bed. 
Of Hatcher's expeditions into the western regions he 
wrote no narrative, but of his great expedition into Pata- 
gonia he, in 1903. presented a splendid and most interesting 
quarto volume of 314 pages. This monumental work, en- 
titled "Narrative and Geography," is inscribed to the man 
that found Hatcher, in the following simple words : "To 
the memory of Othniel Charles Marsh, student and lover 
of nature, this volume is dedicated by the author." Of this 
volume Dr. Dall, himself an early explorer in similar lands 
in Arctic regions, has given a splendid summary, quotations 
from which are here given : 
"About half the total area of the region consists of 
vast terraced plains intersected by river canyons and of a 
subarid character, which, in the central portion, have been 
overflowed by lava beds covering hundreds of square miles. 
To the westward, out of a very mountainous region, rises 
the Andean range, cut here and there by rivers which rise 
in lakes on its "eastern side. 
"At the base of the Andean mountains the Patagonian 
])lains have an altitude of 3,000 feet, and slope very gently 
to the eastward. About fifty miles from the Atlantic coast 
they descend more rapidly by a series of terraces or escarp- 
ments which face to the eastward. The lowest of these 
has an average altitude of 350 feet and terminates in abrupt 
clififs which, for a thousand miles, constitute the margin 
of the land, except for a narrow beach at the base, which, 
